Active moderation by a core of trusted, actively contributing volunteers who have the capability of removing/​hiding content without having to justify all details of such decisions to the membership as a whole. Separate, moderator only discussion space where policies and meta issues can be discussed without detracting from the main content here (and general discouragement of extensive meta discussions in main and discussion forums). Capability and willingness of moderators or at least forum admins to remove, block or bar users if in violation of site policies.
With the right sort of moderators this can be done sensitively to the needs of the community (I write this as a moderator of an unrelated discussion site with about 400 comments a day, most on topic).
Active moderation by a core of trusted, actively contributing volunteers who have the capability of removing/​hiding content without having to justify all details of such decisions to the membership as a whole. Separate, moderator only discussion space where policies and meta issues can be discussed without detracting from the main content here (and general discouragement of extensive meta discussions in main and discussion forums). Capability and willingness of moderators or at least forum admins to remove, block or bar users if in violation of site policies.
With the right sort of moderators this can be done sensitively to the needs of the community (I write this as a moderator of an unrelated discussion site with about 400 comments a day, most on topic).