@EyeSmoke If I don't have to never see or deal with them again that would be perfect. Losing me from their life would be "revenge" enough - I definitely get the better end of the deal and would enjoy the subsequent peace.
Of course, it all depends on the level of offence. Somebody who used my favourite mug without asking might upset me but I'd likely still want them in my life and bear them no ill-will. Somebody deliberately going out of the way to harm my reputation/relationships or who set fire to my house would be a different matter.