There is nothing worse than having an enemy who is a total loser. It's incredibly frustrating when seeking revenge against one, because you come to the realization that there is really nothing you can do to make the person's life worse than it already is. They have nothing to take; there is no way to screw them over if you have been their victim. It's maddening.
Two wrongs don't make a right, but neither does one. Revenge may seem petty by day, but on some nights she becomes Justice.
There is nothing wrong with revenge. The wrong has already been done, or there would be no need to even the score.