Edit: also, see https://news.ycombinator.com/item?id=35760334 - that kind of comment is a bannable offense.
On the other hand, I think a thread like this one also fits your description of ideological battle and flame war. It is very political and deeply biased, including inflammatory comments about imprisoning and killing people for their political ideology. We see that in threads about religion as well, which are very lightly moderated but contain uncivilised content. If you allow trash and ban the pushback, eventually HN will devolve into Truth social or equivalent when it comes to politics.
We can't exclude divisive topics altogether—that would not be consistent with the mandate of this site (see https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so... for lots of past explanation about why). So we ask users on all sides of divisive topics to respect the site guidelines, and each other, by posting thoughtfully and not collapsing into flamewar.
Everyone with strong passions feels like the other side is posting inflammatory trash and they themselves are merely providing pushback. This feeling is part of the standard equipment that everyone brings to a flamewar, so you can't let yourself be guided by it.
What you need to do instead (<-- I don't mean "you" personally, I mean all of us) is hold yourself to a higher standard and not break the rules even if other people are breaking them badly. If you make a good faith effort to do that, then you can just about compensate for the default bias of feeling like "the other side started it and did worse" and approximately level the field.
From my part I also contributed to that in this instance. I understand what you're trying to say and in the future I'll try to keep in mind your larger point - even if I firmly believe I'm right and I would like to convince someone, being rude or dismissive does not actually help, and certainly does not foster a good sense of community. So, I'm not trying to excuse the two comments you correctly called me out for.
On the other hand, perhaps you should consider that your own personal bias about what is legitimate discussion and what isn't is obviously limited by your own knowledge pool and bias. I would not expect you to know how close Brazil came to an actual military coup, or that this "Supreme Court dictatorship" discourse is the backdrop of the justification for a possible coup which is still a threat. I don't think much would be lost at all if these discussions are simply suppressed in HN, in the same way I see you delete submissions about the Ukraine war that are very clearly deranged. And if not, you really should not expect a calm, rational discussion starting around a perspective that defends dictatorship or war.
> you really should not expect a calm, rational discussion starting around a perspective that [...]
I don't know about calm or rational but following the site guidelines is exactly what we expect, regardless of how divisive a topic is. As I said in the GP, a divisive topic makes that more important.