Why can’t we have two sections one moderated and one non-moderated?
People who want to contribute to the moderated section would be asekd to respect a set of rules.
People who want to exercise their freedom of speech can say whatever they want in the non-moderated section.
Another solution is having one section, but asking every contributor to rate his/her own material (the same way tags such as ART and POLITICS are currently used). Then viewers can quickly skip materials which they may find offensive.