I think I'm offering this as an alternative to the theory that a monoculture was intentionally created, which is one which the mod team disclaims as I understand it. But if every individual moderation decision is made on the basis of "disagreeing with the 'accepted' answer is trolling" or something like that, and the HN community is [self-]selected on that basis, then I think that's an equally good or better explanation for what I actually observe in comment sections.