The need for revenge aka justice is a normal feeling. Bringing things back in balance is an element of all creation, it seems. This feeling for revenge has been a tough one for me.
There is much wisdom in the sayings "Revenge is best served cold" and "Revenge is mine sayeth the Lord". TVpeople made the point in another thread that to hold our own we must learn to give Ps nothing, none of our energy. I found that the desire for revenge, now in my later years after much battle in the P monopolized world, motivates me to behave in the way TVpeople suggests even when I have no hope of personal justice with a particular P (past Ps, particularly before I knew what was going on) so as to be strengthened when forced to deal with them now (because this is MY family and I ain't running); also knowing I'm not effective at all if I get my buttons pushed so learning what those buttons are, processing quickly when they are pushed and biding my time until the right moment arrives and it always has when a small subtle move or awareness on my part changes the direction a P intended ("served cold"). And I think we work with the Divine whether we know it or not (no offense meant to the non-believers here), and I have found a benevolent force that works with me -- that's the best way I can describe it.
I don't mean for this post to be interpreted in any way as going against NCEA. This is for when you can't for whatever reason break contact yet.
So I guess what I'm saying is: Consider enlarging your viewpoint of revenge to include these ideas above. It's worked for me so far.