The Chinese have a saying, 'If you want revenge, dig two graves'. Vengeance is a logical emotion. It is often justified. Robert Solomon argues that the Biblical 'Eye for an Eye' was not as barbaric as it now sounds. Prior to that, if someone attacked you - you let all disproportionate hell loose on them. 'Eye for an Eye' was asking for restraint. The problem is, there is seldom agreement on the perfect proportions for justice. The eye of the beholder. So you end up in a spiral of righteous justification when each round of justice requires a response. Someone has to break the loop. Even though revenge is justified, it is not likely to lead to a better situation. Don't throw everything you love away to prove a point. Don't become your enemy in the attempt to defeat them.