Its their subreddit.They can do whatever they want with it. That's really all there is to it. Edit: I wrote everything below this after already posting. I mean, TD bans people for being critical of Trump, as does r/conservative. So they're just as guilty. Of course, site-wide changes would be good. I don't personally like the system in place. But to pretend its just one subreddit doing it? That's simply not the case.

This isn't really censorship. You just broke one of the rules. https://www.reddit.com/r/AskReddit/wiki/index#wiki_-rule_5- "Posts asking users to shame or call out specific people or groups of people will be removed because they lead to witchhunting rather than discussion." Asking people for stories about "corrupt reddit mods" clearly violates the rule. There are a lot of times that reddit does really censor things. But this isn't one of them.