I don't know if it still is, but brining up what others have written in other threads used to be considered "harassment." A complete prohibition against that never made any sense to me, but BITD I got a least one infraction for doing so. In the one instance I remember some troll had made two different posts close in time in two different threads that could not have been more diametrically opposed to each other. I pointed it out and got dinged.