I've mugged quite a few guys.
Generally I get away with it. It's hard to do without power roleplaying, but still making yourself threatening. Point guns that are more powerful than the weak people have, etc.
Just scare people and let them know it would be idiotic to seek 'revenge'.
If they still seek it, kill their ass in front of the world MWAHAHAHAHAHA..... hehe......
Another kind of relevant topic is the overuse of 'epic' deaths. If you're seen by a guy whose friends were killed by you, and he shoots you on the spot, I don't think you should be all angry that it wasn't super cool the way you died. I think if a guy gets shot in the dome and instantly slumps over dead, it's much cooler for everyone than if he had a last speech while he bleed out or some other crap. Point is, try to make the RP cooler for other people, not just yourself, but that doesn't mean you have to make your own experience less fun.