I think about it information theoretically. Oversimplifying, the information content of something is how unpredictable it is in a given channel. On HN, in 2023, the information content of yet another comment ranting about some given city or state or group of people is basically zero. Everyone has seen those comments a thousand times recently and it adds nothing to the discussion.
I think the post itself is worth noting and is interesting. It has room for, how you put it, unpredictable responses. I can't control who or what comments on it, only who to engage with or flag. In that regard, it sounds like a moderation problem more than a content problem to me (Maybe a user problem, but I'm assuming that banning 10 specific users doesn't solve the problem). And I feel you're offering a content solution to a moderation problem, which simply doesn't align.
The real question to ask is: is the moderation inadequate? How do we fix it? I feel like asking to ban these posts is giving up to the trolls and provocateurs rather than fixing the underlying problem.