Personally I think its fraught to try and over simplify anonymous internet conduct, behaviours, moderation, consequences etc. It is complicated, and subjective. But other sites have developed guidelines, there are numerous examples, ST needn't re-invent them imho.

The following (links below) work OK in most cases, the Mods (individual Id's) are quite active on the very busy threads and generally consistent in applying the rules. There are some 'features' which may not be able to be implemented on ST but imo work very well, the thumbs up/down, and the forced disclosure in particular.

Codes Guidelines http://hotcopper.com.au/help/code
Terms of Use http://hotcopper.com.au/help/terms
Privacy Policy http://hotcopper.com.au/help/privacy
Defamation Guide http://hotcopper.com.au/help/defamation