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helltank comments on Causal decision theory is unsatisfactory - Less Wrong
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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?
If only a psychopath would push the button, then your possible non-psychopathic nature limits what decision algorithms you are capable of following.
Wouldn't the fact that you're even considering pushing the button(because if only a psychopath would push the button then it follows that a non-psychopath would never push the button) indicate that you are a psychopath and therefore you should not push the button?
Another way to put it is:
If you are a psychopath and you push the button, you die. If you are not a psychopath and you push the button, pushing the button would make you a psychopath(since only a psychopath would push), and therefore you die.
Pushing the button can't make you a psychopath. You're either already a psychopath or you're not. If you're not, you will not push the button, although you might consider pushing it.
Maybe I was unclear.
I'm arguing that the button will never, ever be pushed. If you are NOT a psychopath, you won't push, end of story.
If you ARE A psychopath, you can choose to push or not push.
In all three cases the correct decision is not to push, therefore you should not push.