If anything, it is the community and moderation teams responsibility to ensure toxic comments are downvoted or removed.
If you decide to never allow anything “controversial” on HN, it is an easy backdoor for bad actors to get articles they don’t like flagged. All they have to do is make comments inciting controversy or astroturf the comments from both sides.
There might also be some kind of fatigue wrt. pandemic news.
If your way of life is changed in a way you disagree with, e.g. forced vaccine or Use of Corona passport, then discussion can get heated and the respect is lost.
In this article i find it unprofessional to flag it, i would sincerely hope that Hacker News is better than that.
It should be the merit of the article and not politics that decide if something gets flagged or not.