Many times revenge is justified by saying "well he did bad so he deserves bad things happen to him" or "if you was a close member of the victim, wouldn't you want bad things to happen to him too?" Usually the eye for eye punishment follows that logic. Well I disagree with that logic, because of a reason I have not seen brought up. Think about it from the perspective of the guy who wants revenge. He wants to cause misery to the guy who did wrong. No matter how bad thing did a guy do, it still only makes him a (bad) human being. Now I believe there is a word for someone who wants misery to other people, ah yes sadist. Does it make it any better if you would like that any harm wouldn't have happened in the first place? Maybe, but it still simply put means that if you are going to lay out an opinion that bad things should happen to bad people just because they have done bad, you're a sadist who wants to see other people suffer... for the sake of suffering.
There migth be so if you find flaws in my logic, point them out.