All posts are reported/modded and forwarded to a forum where all mods can observe/comment. Sometimes decisions are upheld, sometimes not. Sometimes a heavier penalty is imposed. I can assure you that it is all done in a way that ensures participation from everyone, and nothing is done
arbitratially. It may seem to you that it's not, but I can tell you from first hand experience, that it is.
Just because you don't agree with something, doesn't make it wrong, or a mistake.
ETA; If you don't like the "censorship" leave. A private BBS has no constitutional obligation to provide you with a forum to say anything. Might want to read up on the issue.