The idea that if you see something unmoderated, it must mean that the moderators secretly agree with it, is a non sequitur. What's actually happening is that we only see a portion of what gets posted to HN, and we can't moderate what we don't see. That's why the site guidelines ask you to flag bad comments and, in egregious cases, to email hn@ycombinator.com. Fortunately, another user chose to follow the site guidelines and did so.
Please see https://news.ycombinator.com/item?id=21003570 for more.