This is the standard (human) answer, and not very interesting.

Well, you were the one who said "if you have any reason other than X or Y then I'd be very interested to hear it" where X and Y don't cover the "standard answer", so it hardly seems reasonable for you to complain that the standard answer isn't interesting.

(I also think it's highly debatable whether those internalized social prohibitions are best described as "fear of repercussions that is active even when I know consciously there's nothing to fear". You've certainly given no reason to think that they are.)