This is my only concern really as well... That and the "no pedantry" rule which, although I agree with in general, might be poorly enforced. I mean pedantry is important in quite a few instances (perhaps science, law, philosophy, etc.) to ensure complete understanding/correctness.

I can mostly get behind no blatant hate speech. So long as it's not abused. I'm pro gay marriage for example, but I still would want to hear even poorly reasoned arguments against it if someone wants to voice them [not just insults - actual reasoning] and if there are any studies that might not be politically correct but are done decently I would really prefer they don't get banned.