Accounts that have been created to do that are low-quality accounts that soon accrue moderation penalties and eventually get banned—not because we disagree with the politics but because this is the main form of flamewar destroying this site. HN is a place for intellectual curiosity and curious conversation. If you want to do ideological warfare on the internet, that's a different game and you need to play it elsewhere.

Your comment didn't get removed. It did get detached from its original parent. That's standard moderation when the top comment gets replies that don't respond specifically to what it says (a.k.a. topjacking).