IMHO, what you did wasn't bad. Wishing karma on someone isn't a bad thing, it's just like watching Court TV or something and wishing the defendant gets what he deserves. And giving karma a little push isn't bad either. You didn't choose the punishment. The universe will take care of it. Remember, if you do bad things, bad things come back to you. Maybe not in a timeframe that you can associate the two, but they do. No one ever really gets away with anything, not really.