HN isn't dumb. Some discussions tend to get off the rails, sometimes badly, and on some topics it happens more often than on others. But this is not a random public Facebook group or a Twitter pileup either.

The top-level comment is upvoted because it (at least in my eyes, and why I upvoted it) points to social sciences backing the conclusion that's, to some HNers, quite obvious both from observable behavior and first principles. Sociology is one of the fields where you'd expect to find research on this topic. Social sciences get criticized a lot on HN, but so are in the wider academic community, and there are good reasons for it - but I don't believe anyone on HN seriously claims that social sciences are incapable of "deriving legitimate conclusions". Most conclusions may be wrong, but some are salvageable, and plenty others survive the test of time. The SNR may be worse in sociology than in physics, but the signal is there, and HN does (usually) recognize this.