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When we saw movies and read books about revenge, we always thought how cool and just it was. What always motivated the hero was "I am obligated to do justice."
But when I started looking at these stories from a perspective that tried to figure out the smartest way to maximize utility, I saw how ridiculous and stupid revenge is.
People may not understand this because they are acting on emotion. And therefore justifying stupid actions that they do. And the real answer is if you want to continue from the bad place you are in right now because of someone, the rational thing to do is to do what you can to grow back to where you were instead of spending your energy on things that happened in the past and cannot be changed.