I think in the situations you describe it's much more effective to have some kind of authority in place to discipline people for this kind of behaviour rather than relying on abuse. Especially since it's usually done by trolls for whom the emotional response is the objective. I think a brief "This is in breach of rule X, you have been banned for Y days" combined with locking/deleting the relevant comment, is far more effective at discouraging negative behaviour than angry tirades.