I find these claims of the HN mods getting angry at people for posting certain viewpoints baffling. I've been browsing this site for a while and I've never seen that happen, and the only mod actions I've seen are against people who were deliberately trolling, flame-baiting or insulting other users. If your experience of posting about post modernism involves mods getting angry at you, it is far more likely that those posts involved those things than any kind of ideological censorship.