But how great would it be to actually see this process in effect?
I think it'd be extremely satisfying to watch this self-correction. With or without a whispered "I told you this'd happen if you kept behaving like that years ago..." to the karma'ed being. Not only would it give you a feeling of vindication, it'd provide 'closure' (a overused word/concept I've always abhorred). You could brush your hands off, paste a satisfied smirk on yer gob, and walk away clean.
And maybe ~ if you knew that someone would be 'taken care of' ~ people wouldn't be so nasty to each other.