From RealNamesPlease: In general, it is observed that people who use online nicknames care less about what they write. The discussion is usually taken more seriously when people do not use nicknames, but use their real names.
What if we made this rule? Only stamp a person's home page with "RealNamesPlease" after they demonstrate carelessness or damaging non-seriousness.
See also the harsher but more accurate RealNamesOnlyOrAnonymous