Revenge is easy to understand. It is a universal response to the anger we feel towards those who have done us harm, betrayed us, violated us, stolen from us, hurt us ... Revenge fuels more hatred.
Even the gods of Christianity, Islam, and Judaism are vengeful, cruel, and ruthless. They severly punish and seek revenge for disobedience. Their behavior sets an example for men.
Seeking revenge can become a bad habit, an addiction, a endless cycle of bad faith and violence.