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.

if you push, that's evidence you are a psychopath. If you are a psychopath, you should not push. Therefore, you will always end up regretting the decision to push.

If you don't push, you don't push and nothing happens.

In all three cases the correct decision is not to push, therefore you should not push.