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Plasma Bloggin''s avatar

Probably the most well-known philosophical argument that has a completely decisive refutation, but for which the refutation is not that well known is the Laplace's Demon argument. Specifically, the argument that determinism entails that it is in principle possible to know in advance what actions you will take by calculating them from the physical laws and initial conditions, and that having this knowledge in advance means you can't choose freely. The refutation I know of comes from a paper by Richard Holton called "From Determinism to Resignation, and How to Stop It," though it's possible someone else has made a similar refutation before this.

Basically, it turns out that the first premise that determinism entails the possibility of foreknowledge of your own actions is just false. The problem is that, although determinism does entail that any of your actions could in principle be calculated from the initial conditions and physical laws (well, assuming that the laws of physics are computable anyway), it does not entail that it's possible for that calculation to be done and for its result to be revealed to you before you perform the action, and this latter possibility is what's required for the argument against free will to go through. In fact, even in fairly simple deterministic systems that we can build in real life, this assumption is demonstrably false. Holton gives the example of a machine consisting a light bulb connected to a light sensor, which will turn the bulb off at noon if it detects light before then and on if it doesn't. Your goal is to predict whether the light bulb will be turned on or off at noon in advance, and reveal your prediction to the machine by presenting it with your own light if you predict it will turn its bulb on, and no light if you predict it will turn its bulb off. Since the machine always does the opposite of what you predict, it does not matter how much computing power you have or how precise your knowledge is of the initial conditions and laws of nature - you will never be able to predict what the machine will do and reveal the prediction to the machine beforehand, even though everything in the scenario is deterministic. This is because the revelation itself has an effect on the machine, and determinism does not stop it from acting as a prediction fruatrator that will always just do the opposite of what anyone predicts it will do (after all, being a prediction frustrator is a perfectly deterministic process).

Of course, the same is true of human actions - predictions of what we will do can affect what we end up doing, and we sometimes decide to do the opposite of whatever is predicted of us. Determinism does not magically make this impossible. It turns out that what's actually impossible is to perform the calculation and reveal the result to someone determined to frustrate your prediction - the mechanistic reason is that, in order to predict a frustrator's actions, you would need to first calculate all the things that causally affect their actions, but one of those is the outcome of the prediction itself, so any attempt to perform the calculation is going to get stuck in an infinite loop.

So based on the above, I consider Laplace's Demon to be a "zombie argument" against compatibilism in the way you used the phrase here. There's also a misconception that compatibilism is redefining free will when in fact most compatibilists hold themselves to be talking about the same concept as incompatibilists, and that incompatibilists are just wrong when they say this concept is incompatible with determinism. So any argument that treats compatibilism as if it's just a redefinition rather than a substantive thesis is similarly a zombie argument.

Misconceptions about utilitarianism are a big pet peeve for me as well, though of course, you already mentioned those. In particular, the idea that utilitarians value the abstract utility function itself, rather than concrete individuals and instances of wellbeing, and the idea that utilitarians treat individuals as "mere means" when the entire theory is based on the idea that everyone should be treated as an equally important end in themselves. I think both of these should be considered philosophical myths, since they're based on misunderstandings of the view, and yet they persist as prominent objections. I would also add epistemic arguments against utilitarianism here, since they tend to completely ignore the concept of expected value and decision theory, making them dead on arrival despite being constantly brought up.

The good news is, there are some arguments that really have been decisively refuted in a way that philosophers have become aware of and agree on, so it's not inevitable that historically important arguments will always continue to amble on despite refutation. Arguments for fatalism that rely on the modal fallacy are the case that comes to mind for me.

Arguments against various forms of reductionism that conflate, "X can be fully described in terms of Ys," with, "X is just Y," where the latter is meant to imply a lack of the higher-level properties associated with X, are a borderline case: You still hear such arguments all the time, but it seems they're generally recognized by philosophers as being fallacious.

Daniel Muñoz's avatar

Just seconding that “Value Receptacles” is criminally underrated. It’s one of my very favorite papers in value theory from the last 25 years!

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