Ever since, I've constrained my activity on here to the special interest forums (music, tabletop gaming, reading etc.) Look through, say, the last few weeks of my posts. Since I'm simply discussing a hobby and interest which is similarly shared by other denizens of that forum, the interactions have been civil and entirely without incident. As opposed to the highly volatile and polarizing nature of a politics forum.
Why is that? Because there is literally nothing here that can't be explained by childish tribalism and hatred stemming from political factions. That's all that is, and there is nothing this can't explain.
I'm actually adhering quite well to your exhortation to interact civilly and substantively here, which is exceptionally easy when I stay in the special interest forums, for those reasons I just outlined.