I think that's a stark contrast with reddit, where being a dick is often excused if one has the right ideology. Not to mention that many subreddits (especially, but not exclusively, the political ones) have become carefully maintained echo chambers thanks rules against disagreeing with even a single facet of the "correct" beliefs. r/The_Donald even had an explicit "no dissent" rule.
I believe this policy is actually responsible for political subreddits there being so consistently toxic. The site’s moderation encourages extreme ideological echo chambers to form in which members can be almost arbitrarily uncivil as long as they exist within that community’s ideology.
It's what you don't see, friend.
I too miss the old forums you had dedicated to one thing and set up by volunteers who liked that one thing and weren't interested in growth above all.
I'm guilty of engaging in discussing politics here (and tried to do so in a factual and respectful manner) but it's pointless. It just becomes people talking past each other and generates arguments rather than dialog.
You can argue for most points of view here, so long as you remain within their decency guidelines. Obviously HN won't tolerate certain extreme ideas that involve genocidal camps, killing people, violence or racism, that you might see bubble up out of eg the pro fascist or pro communist camps.
If there are 20 slices in a gradient of political ideology in the US (as an example), HN will allow you to very freely argue 18 of them, only dropping the extreme left and right (both of which commonly involve arguing for murder, racism, genocide, oppression, gulags, forced re-education camps, violence and countless other horrible things).
If you go into the largest political sections of Reddit arguing strongly (but decently) for Trump, you'll get moderated because the mods won't like you. That doesn't happen on HN, Dang will mostly leave your opinions alone (you will get downvoted though), so long as you are arguing in a way that isn't belligerent.
https://www.wired.com/2015/07/reddit-ceo-ellen-pao-steps-dow...
Turns out only allowing speech that you deem acceptable makes for a pretty boring internet forum.