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lackofcheese comments on Causal decision theory is unsatisfactory - LessWrong
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What would you say about the following decision problem (formulated by Andy Egan, I believe)?
You have a strong desire that all psychopaths in the world die. However, your desire to stay alive is stronger, so if you yourself are a psychopath you don't want all psychopaths to die. You are pretty sure, but not certain, that you're not a psychopath. You're presented with a button, which, if pressed, would kill all psychopaths instantly. You are absolutely certain that only a psychopath would press this button. Should you press the button or not?
It seems to me the answer is "Obviously not", precisely because the "off-path" possibility that you're a non-psychopath who pushes the button should not enter into your consideration. But the causal decision algorithm would recommend pushing the button if your prior that you are a psychopath is small enough. Would you agree with that?
Shouldn't you also update your belief towards being a psychopath on the basis that you have a strong desire that all psychopaths in the world die?
You can stipulate this out of the example. Let's say pretty much everyone has the desire that all psychopaths die, but only psychopaths would actually follow through with it.