That's not how HN works. People don't get to break the site guidelines regardless of the topic, and people are welcome to make their substantive points thoughtfully regardless of their views. Killing the entire thread would be to punish the latter for the former.

https://news.ycombinator.com/newsguidelines.html

It's been this way for a while. Someone once made a post saying "Christianity is a perfectly peaceful religion and has met benefitted historical society" and then someone replying with "They genocided countless people and nations" would then get a "this is against site rules'.