How is this story not on the front page anymore? 375 comments. Seems like a big story to me.
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If lots of people are upvoting and downvoting the same comments, that's treated as a signal the topic is contentious and people are likely to start behaving badly.
HN is very clear they prioritize good behavior as the long term goal, and they are as a result comfortable having contentious topics fall in the ranking even if everyone involved in the discussion feels the topic is important.