Lots of comments in this thread have been expressing negative opinions. The only issue is that such comments need to remain within the site guidelines (
https://news.ycombinator.com/newsguidelines.html). Those rules don't get suspended when people feel strongly for legitimate reasons—if we did that, we might as well not have the rules at all.
It's true that there's an asymmetry in that it's much easier for the people making positive comments not to break the site guidelines. In a way that's not fair—but it applies to all threads equally, regardless of whether the topic is monarchy or something else. It's also an unfairness we can't do much about—it's intrinsic to the problem of how to operate this forum.
We do try to make special allowances for negative comments that break the site guidelines but also include enough information to explain why the person feels the way they do, in a way other commenters can learn from. I did that in a few cases in this thread. What we don't make special allowances for is garden-variety flamewar, which there was also a ton of in this thread.
If you see comments that did not break the site guidelines but were moderated anyhow, that's bad and I'd like to see links so we can correct our mistakes (or, in the case of user flags, user mistakes). Mistakes are inevitable when trying to moderate threads with 1500 comments or whatever; moderation is guesswork, and hasty guesswork at that. But we're always willing to take a second look, and when we do see a mistake, to acknowledge it and fix it.