good rules and UI can help, but good UI won't change the way people are, and for any given set of rules, people motivated by strong emotions will find creative ways to break the rules to get their needs satisfied.
the only 100% reliable solution is to completely remove their freedom of expression (eg, with an all-powerful moderator, whose interpretation of the rules is law).
the only 100% reliable solution is to completely remove their freedom of expression (eg, with an all-powerful moderator, whose interpretation of the rules is law).