Is it due to HN policy? I guess they're subjective and ideological, and prone to starting arguments rather than debates.
Maybe "Please don't use Hacker News for political or ideological battle. That tramples curiosity." or "Please don't pick the most provocative thing in an article or post to complain about in the thread. Find something interesting to respond to instead."?
I'm honestly just curious as a conscientious internet citizen lol
Removing moderation or voting systems (simple chronological comment sorting) creates another set of issues so this problem can't be solved without entirely changing discussion formats