Moderation of any forum is difficult. You can never have absolute free speech. Aside from any other issues, the site would be most likely sued within the first few months. I'm not exaggerating to prove a point. If anyone could write anything about anyone else relatively anonymously (I don't believe anything is ever truly anonymous unless you get into the ridiculous with regard to devices) and it was left up, then there would be serious issues.
Having said that, I do think that there is a problem and it is a big one.
It's difficult if not near impossible for any moderator to remove their own personal bias. Even if you think you are actively trying to do that, believe me, you aren't! It's just human nature. In fact some people can try to do it and go too far the other way, although I don't think this is the case here. I can accept that in a way - to some degree - as I think it's near impossible to override but if someone is trying to actively shape the discussion then that is wrong and it will be very transparent.
What I find difficult too is that funny or lighthearted threads often seem to be removed.
A lot of the more elaborate trolls write threads disguised as being reasonable but it is actually some weird kind of baiting. So then if you write a thread about an everyday occurrence the moderators may look at it closely and they don't take it at face value because of the other threads and they delete it. Or, maybe I am being too generous there.
I have no idea who it is and it may be a group of people or one person or two or who knows, but there does appear to be some level of moderation which appears to be done not with good intentions.
I think there needs to be clearer posting guidelines. If posts keep being deleted there comes a point where people stop trying to post.