I really worry for the people in the US, but I'm hopeful it's hegemony is ending.
The issue, of course, is that literally anything can be "political", and moreover by trying to actively avoid political discussions you sort of tacitly endorse the status quo.
It's a tough line to draw, and I'd be lying if I said where I knew where to draw it; HN is a fun forum specifically because the moderation is generally very good. They're not perfect but they do try and shut things down before they devolve into flame wars and personal insults. If there weren't aggressive modding, HN would devolve into 4chan or 8chan, and it wouldn't be appealing to me after the age of ~17.
You're correct that we like to avoid flamewars, but not correct to say "anything involving politics". We don't try to (or want to) avoid politics altogether—a certain number of threads with political overlap have always been part of the mix here*. For (reams of) past explanations see https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so....
What we want to avoid is HN being taken over by politics altogether, and thereby turning into an entirely different site. We want HN to adhere to its mandate, which is to optimize for intellectual curiosity (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...). That certainly includes some political discussion, but (a) not beyond a certain threshold, and (b) not every kind of political story or article. (For example, opinion pieces are usually less of a fit than stories which contain significant new information, and so on.)
Unfortunately, this way of doing things inevitably generates conflict. For politically passionate users, that "not beyond a certain threshold" bit is far too little—especially in turbulent times, as now. Apart from that, there's no agreement on which particular stories deserve to be on the frontpage, and even if there were such agreement, there's still no way of making sure that the most deserving stories get the spots (>>42787306 ).
Everyone has the experience of being frustrated when a story that they care about gets flagged or otherwise falls in rank. When feelings are running hot, people jump to the conclusion that we're secretly on the opposite political side, or trying to suppress discussion on a particular topic. That's not the case at all—it's all explicable by the principles that we've been repeating for years—but that none of that changes how it feels.
Then there are the users who feel like HN has gotten too political and is a shadow of its former self—this also has always been with us: >>17014869 .
Double unfortunately, I don't know of a fix for any of these binds, because all of them derive from the fundamentals of what HN is - e.g. a single frontpage with only so many slots (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...).
(* Or to put it differently, note the words most and probably in https://news.ycombinator.com/newsguidelines.html, as pg once said: >>4922426 .)