On these sorts of discussions, talking about what is actionable, what we can do to reach common goals.
Though there are pretty fundamental disagreements among people on these as well, and I'm not sure where the discussion can go (for example University quotas).
But trying to get HN to be more positive overall would be encouraging. I believe this was done for Show HN stuff, having it done overall seems like an interesting next step.
Even just a msg above the reply box like "Hey, you're talking to another human being! And probably agree on a lot of things"