You might have a mistaken idea of how HN works, which is maybe why you've been finding it frustrating. On HN, it has always been ok to downvote a comment because one disagrees with it: https://news.ycombinator.com/item?id=16131314

Sure that's controversial, but the controversy is perennial. People have been making exactly the same arguments about it for a dozen years now, and that's just on HN—the debate goes back well before that. Different takes are possible. HN has its take. It's stable, we're not going to change it, and in my opinion it works relatively well. Moreover, the problems with it are not the problems that the users who post complaints about it are complaining about.