You need things in your life. You need to be accepted, loved and respected; we all do. You need your friends, your family and purpose in life. All of those things are difficult to come by and take a lot of work.
You can’t have the important things in life as long as you hold onto hate or anger. If you want to retaliate or EVEN the score, then you will have no time for anything purposeful. Be so busy living your life that you have no time for anything but happiness.