Sure, divisive topics are political, almost by definition. No argument there.
This point is a factual one though. People's perceptions of skew on HN are massively distorted by cognitive bias, and that includes your perceptions if you think that HN is "made up of primarily right wing users".
Please don't underestimate this phenomenon. It's probably the most significant one that I observe here and it's incredible how reliable it is.
For example: you're reacting to two police-related submissions getting flagged and seeing that as a sign of right-wing users dominating the site. (Actually, I can tell you for certain that some of the users flagging these are left-wing users who must have other reasons for flagging it.) Meanwhile you're not counting the many major threads that HN has had about police brutality in the last couple months. There was one yesterday, in fact: https://news.ycombinator.com/item?id=23860829.
If you look at https://news.ycombinator.com/item?id=23624962, you'll find an analysis I did a few weeks ago showing how George Floyd-related topics, including police brutality, were by far the most-discussed topics on HN in the previous month. That's a fact—and yet it doesn't stop people from claiming, not just that the topics are underrepresented (which would already be completely mistaken) but that they are being completely suppressed! ("aggressively removed from discussion", one complaint said.)
That is the bias I'm talking about in action. You simply can't go by what you notice and dislike (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...). If you do, you may well end up with a picture that it is the exact opposite of what's really going on here. Needless to say, I'm not talking about you personally, but about all of us.