I'm describing the system as I understand it. (I'm not a mod, or a founder, just a long-time participant in HN and observer of it, as well as numerous other fora over the past 40-odd years.)

The Minnesota ICE murder story has had multiple submissions and discussion. The Palantir-founder tweet-based story only one AFAIU. HN deprecates repeated discussion of a given topic.

(Dang and other mods discuss this point often.)

Again, I'm describing HN's dynamics, and how to intervene effectively should you care to do so. I'm not defending it, though I'll grudgingly admit it works pretty well much of the time. Politics (of virtually any stripe or national focus) tends to be far more failure-prone, however.