I've noticed that established users are practically immune to the consequences of being incivil if they aren't absolute trolls. I mean, I could probably say "fuck you" to a number of people right now and get away with it.
Wouldn't it be nice to introduce something similar to 3rr except for incivility? Ie. if you make a personal attack you get blocked for 6 hours or 12 or some length shorter than 24. There is of course the obvious problem that what constitues a personal attack is completly subjective, but I thought I'd post this anyway.