• Deconstructing the Popular Use of Occam’s Razor – An Argument Against Naturalism?

    A chap called Lothar’s Son from Germany has contacted me to offer an argument against naturalism which he has posted on his blog. His blog, lotharlorraine, hosts the piece which can be found here. Please feel free to comment there as well as here. Thanks for LS for contacting me! Here is his argument, with kind permission:

    Deconstructing the Popular Use of Occam’s Razor

    Occam’s Razor (OR) seems to lie at the very core of the worldviews of naturalism and materialism. It demands only few imagination to realize the pair would completely collapse if the razor were cut off.

    Also called principle of parsimony, it exists in two forms: a methodological form and an epistemological form.

    Methodological Razor: if theory A and theory B do the same job of describing all known facts C, it is preferable to use the simplest theory for the next investigations.

    Epistemological Razor: if theory A and theory B do the same job of describing all known facts C, the simplest theory is ALWAYS more likely.

    Here, I won’t address the validity of the Methodological Razor (MR) which might be an useful tool in many situations.

    I am much more interested in evaluating the Epistemological razor (ER), since it is under this form it most always plays an overwhelming role in philosophy, theology and the study of anomalous phenomena.

    Nowadays, the most popular argument for atheism looks like this:

    1. It is possible (at least a priori) to explain all facts of the Cosmos as satisfactorily with nature alone as with God

    2. ER: if theory A and theory B do the same job of describing all known facts C, the simplest theory is ALWAYS more likely

    3. God is much more complex than nature

    4. Nature alone is much more likely to be responsible for reality than God

    Of course, since neither God nor nature can explain their own existence, ER stipulates that the existence of nature as a brute fact is much more probable than the existence of God as a brute fact.

    ER is employed in a huge variety by proponents with diverse worldviews. This is the main reason why most scientists believe that UFO cannot be something otherworldly.

    Despite the voluminous literature related to ER, it comes as a surprise that only a few publications deal with its justification. And unlike the expectations of its most enthusiastic proponents, such a demonstration proves a formidable task due to its universal claim to always hold true.

    In this entry, I’ll show why I’m under the impression that nobody has been able to prove ER without begging the question in one way or the other.

    One common way to argue is by using a reductio ad adsurbum.

    Let us consider the following realistic conservation I could have with a UFO denier.

    Skeptical Manitoo: „I was really shocked as I learned you believe all this non-senses about flying saucers!“

    Lothar’s son: „Actually, this isn’t quite true. I do believe most of them can be traced back to natural or human causes. I’m just undecided about a small minority of them. I consider it possible that something otherworldly might be going on…“

    Skeptical Manitoo:„What??? How dare you utter such lunacy before having drunk your third beer? The UFO hypothesis is the most complex one, therefore it is also the most unlikely one!“

    Lothar’s son: „And how the hell do you know that, all other things being equal, simpler explanations are always more probable?“

    Skeptical Manitoo: „And how do you know otherwise that the traces on the field stem from some wild living things rather than from elves?“ he replied bitterly.

    At the point, the skeptics expects me to recognize this is silly indeed, AND that the only way to avoid this madness is by believing ER, so that I’ll end up agreeing with him.

    But this is only a pragmatic argument, it has no bearing on the truth of ER whatsoever.

    What if I stay stubborn:

    Lothar’s son: „I believe your elfic intervention is also within the realm of possibilities, even if it is more complex.“

    Skeptical Manitoo: „What? And would you also tolerate the presence of a Flying Spaguetti Monster which has caused the rain shower which fell on us previously?“

    Lothar’s son: „„Of course!“

    Skeptical Manitoo: „What? And do you also believe in a flying Dick Cheney who threw bombs upon the civilian population in Iraq?“

    Reaching this level of insanity, I might very well be tempted to nod in order to escape the ordeal.

    But it is important to realize that this whole discussion only shows, at best, a pragmatic MR to be valid.

    If there is no INDEPENDENT ground for rejecting the crazy situations my imaginative friend has mentioned, anti-realism seems to be true, which means we can never have any kind of knowledge.

    To justify the Epistemological Razor, one clearly needs non-circular arguments which might come from pure philosophical considerations or experimental inferences.

    A very commonly used one is the alleged inexorable progress of science towards the simplest explanations.

    There are many problems with this argument. The history of science is full of examples of complex theories who were wrongly dismissed because of their lack of parsimony, tough the future vindicated them in the most triumphant way. Continental drift and the reality of ball lightnings are only two examples on a long list.

    But let us suppose for the sake of the argument that during OUR ENTIRE history, the simplest theories always proved to be the most likely.

    Would this show that ER, as I’ve defined it above, is true? Not at all.

    All this would prove is that we live in an universe (or perhaps even ONLY a region of an universe) where things are as simple as possible.

    But modern science seems to indicate there exist a gigantic (perhaps even an infinite) number of parallel universes out there. And as Max Tegmark pointed out, these are not only limited to those resulting from chaotic cosmic inflation and string theory, but include as well quantum universes (Everett’s theory) and perhaps even mathematical universes. Simulated universes can certainly be added to this list.

    So ultimately the justification of Occam’s razor would look like that:

    1. in our universe, simplest explanations are always the most likely to be true
    2. if it is true in our universe, it is also probably true in the other 10000000000000000000000000000000000…… universes we know very little of
    3. therefore, in the entire reality, simplest explanations are always the most likely to be true.

    I hope that most of my readers will realize that premise 2) is an extraordinary claim, an interpolation based on nothing more than wishful thinking.

    I know there have been many elegant attempts to ground ER on bayesian considerations. Like philosopher of mathematics Kelly I believe all are hopelessly circular because they smuggle simplicity into their definition of reality.

    I’d be glad to learn from my reader if they know ways to justify ER which don’t presuppose the existence of a simple multiverse in the first place.

    Finally, I want to point out a further problem one should have using ER against the existence of


    The Kalham’s cosmological argument (named after a great Muslim theologian) tries to establish the existence of a transcendence as follows:

    1. Everything that begins to exist has a cause
    2. the universe began to exist
    3. therefore the universe has a cause

    Due to the overwhelming experimental and theoretical success of the Big Bang theory, atheist apologists can no longer deny premise 2)

    Consequently, they typically deny premise 1), arguing like Jeffrey Jay Lowder that it is not always true.
    Lowder agrees it would be absurd to believe something in our universe could pop into existence, and this is the case because all our experience allows us to INDUCTIVELY conclude this is never going to occur. But he also emphasizes that this inference is only valid for things taking place WITHIN our universe, and not outside.
    Since the grounds for believing in 1) are limited to our experience in this universe, we’ve no warrant to assert it is generally true.

    But this is exactly my point about Occam’s razor or the principle of parsimony.

    It might (or not) be true it holds in our universe, but this gives us absolutely no justification for believing it can be applied to transcendental realities (or to rule them out).

    So, this was admittedly a very long post, and I hope to receive lots of positive and negative feedbacks!

    So, lots to talk about there, not least the erroneous declaration of premise 2 of the KCA. I don’t want to get into a KCA debate here, suffice to say that premise 2 is certainly not tenable in the manner which LS thinks. Take something like Loop Quantum Cosmology, for instance. Cutting edge physics concerns itself very much with premise 2. People like Craig cherry pick their science there. I believe even Vilenkin himself is working on a paper about this.

    But let us keep to the topic of Ockham’s Razor (OR). LS mentions Kelly. Kevin T. Kelly is a philosophy professor who has looked to prove OR mathematically. See here, but also his interview with the Infidel Guy about it.

    The problem is, OR seems to be an inductive argument used pragmatically, and so extending it in the way in which LS does to “ALWAYS” be the case appears to be extrapolating an inductive conclusion to a deductive premise. In fact, ironically, this is a move which the KCA does with both opening premises of its arguments!

    The main thrust of the argument appears to be that to justify OR one needs an independent, non circular way of doing it.  But this is similar to the critique of reason. One cannot justify reason without appealing to reason. True, but we do all the time, and we use it because reason works. On balance, if we can show OR to be pragmatically useful and successful, then it is at least a good rule of thumb. I am not sure anyone particularly uses it as a steadfast intrinsic truth. In fact, to draw further analogies with the KCA, this is precisely the move done with ex nihilo nihil fit, out of nothing nothing comes. This is something people like Craig claim is one of the most basic philosophical truths or intuitions. Yet it is merely an inductive observation (an erroneous one at that). One must differentiate between such approaches, between intrinsic, analytic conclusions, and inductively derived synthetic truths.

    “There are many problems with this argument. The history of science is full of examples of complex theories who were wrongly dismissed because of their lack of parsimony, “

    But that depends where your theory ends. Now add God, or another layer of complexity on, and ask it to do the same thing… I think it is important to note that any use of the OR is in the context of our limited knowledge at the time of theorising. So when proposing OR to help explain the universe, but preferring more complex multiverse, that is because multiverses do a better job at explaining new or problematic data. It is not because multiverse theory, being more complex, is just arbitrarily preferred over a simple single universe. As LS stated:

    “if theory A and theory B do the same job of describing all known facts C, it is preferable to use the simplest theory for the next investigations.”

    The single universe obviously isn’t on a par with the multiverse for explaining C.

    This methodological approach is all that is necessary, in my view. I am not sure of the application of the epistemological approach. I think it IS an inductive, scientific tool which is more probably right given past successes and so can be applied to anything concerning the natural sciences and philosophy. It is not necessarily true, I would agree (intuitively, without having studied OR too much).

    That’s about it for now, early in the morning. More of a ramble than a focused examination.


    Category: NaturalismPhilosophy


    Article by: Jonathan MS Pearce

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    • Andy_Schueler

      A very commonly used one is the alleged inexorable progress of science towards the simplest explanations. There are many problems with this argument. The history of science is full of examples of complex theories who were wrongly dismissed because of their lack of parsimony, tough the future vindicated them in the most triumphant way. Continental drift and the reality of ball lightnings are only two examples on a long list.

      This is completely wrong – who argues that? (I´ve never heard anyone claiming that science always progresses towards the simplest explanations…). And the principle of parsimony does not mean that a theory is merely chosen because it is simpler, it means that a theory is simpler than a competing theory, but is equally well supported by the available evidence and is also equal in terms of explanatory power (strange that Lothar´s Son got that right in his definition at the beginning but then attacks this strawman here). If a theory is more complex, but has more evidence that supports it and more explanatory power – there is no contest, the theory with more evidence and more explanatory power wins by default and Occam´s Razor is completely irrelevant in such a situation.
      Also, continental drift was not initially rejected because of Occam´s Razor – it was rejected because nobody could think of any remotely plausible mechanism for how continental drift could happen at that time.

      • Good points, Schueler!

        • Daydreamer1

          Well put.

          I think he has heard occams razor used a lot and so thought that it is an argument on its own.

          He is ignoring that occams razor must not ignore evidence and that the point is to simplify only as far as the data and theory allow. Occams razor does not mean that an idea is going to be simple. It could be so hard that it takes us one thousand years to crack and it will still fit occams razor just fine. He seems to have completely missed this in a rush to think that since occams razor does not predict evidence it does not have that other peoples past mistakes mean his unrelated claims are more likely to be true. It is a shame the real world doesn’t work like that since we would be thousands of years more advanced by now.

    • Daydreamer1

      Well, LS is right that the way he is using this means it doesn’t work. Revealing though that a little game is being played. To make it more visible imagine it mathematically. A theist adds 2 and 2, they get 5. Quick, look, scientists are wrong and God is more likely than naturalism!
      It doesn’t matter that occams razor incorrectly predicts future accuracies, since it does not deal with them! It deals with what evidence you have on the day – and it handles that really quite well. LS seems to expect occams razor to magically predict what evidences will be found and somehow objectively quantify them without having them. The missing realisation is that discovery is precisely that, and occams razor is not a magical way of seeing around the corner.

      So, what is it then? Where is LS going wrong? A good place for LS to start might be by conceding that occams razor weighs evidence, not simplicity. It is a method of reducing to the simplest forms and comparing, not ignoring, data.

      For example: 2+2=4, and 2+2+X=4 where X is the total mass of all unicorns minus the total energy of the universal unicorn balancing force.

      Both equal 4, just as predicted!!!! Wow, it is clever. But occams razor is a simple way of saying that the unicorn idea is an unnecessary add-on.

      LS seems to want to say that because occams razor has not magically predicted the future in instances like plate tectonics (that it has not proven itself capable of working ahead of the primacy of gathered evidence) that the unicorn idea is somehow more likely to be true. This is false. The unicorn is not even 1% more likely to be true. For unicorns to be more likely you would need to provide an input that makes them more likely. Occams razor is not itself an input, so its failures (using LS’s values, not mine, since it cannot fail in something it does not do – i.e. it cannot predict plate tectonics on its own) in one field cannot increase the probability of other ideas.

      And I note that as well – that LS has attempted to use the failure of occams razor in one field to argue that it increases the likelihood of an entirely different claim in an entirely different field being correct. There are surely logical issues there.

      Aside from all that – I mostly agree with LS in the sense that occams razor should not be used as much more than a surface level point – just that ‘I have no need of that hypothesis’ is a fair point, and if you have added something that doesn’t add anything to the actual working of the explanation then it can be removed without effecting it just as easily.

    • Hello Jonathan and other fellows!
      As soon as I find time, I will post a response to your interesting challenges on my blog:

      Lovely greetings from Germany.
      Liebe Grüsse aus Deutschland.

      Lothars Sohn – Lothar’s son

    • Pingback: Ockham’s razor, the Origin of the Universe and the Search for an Air-tight Argument | lotharlorraine()

    • Hello Jonathan, this is my reponse :=)


      To my mind, it would be a bit more meaningful to pursue (at the moment) the discussion there, but feel free to answer me wherever you wish.


      Lothars Sohn – Lothar’s son