Your framing of all of this, including narrowing it down to just a few things and asking “do you think the combination of factors above is problematic?” is emblematic of the kind of subversive pidgeonholed discord that’s very useful for adversaries to control narratives (see f.e. “Nerd Sniping”).

I’ll answer by saying this: HN, for example, is already taken over. There are nationalistic and politically-inclined shill groups (paid, and useful idiots) already in here and have been here for some time. The upvoting/flagging system is broken as a result since opposition can be easily quashed by downvoting/flagging without manual intervention. Daniel is one lad, he can’t keep up with all of this (but kudos for trying, really). The shit faucet diameter is just too large. My thinking? We’ll need to take a page out of 4chan’s book because placing speech silencing tools in front of users is a dead end. Whatever you do to try to control things, an adversary will gain control of and use it to control the narrative. It’s right there on Reddit.

Don’t take my word on it. Foundations of Geopolitics spelled this out long before most of the internet as we know it today was a thing.