When you hit someone with anger, criticism and complain, you are not hitting them but satisfying your own ego. It is mostly a revenge you are taking because others might have done so to you at some point of time. By doing this you are involuntarily becoming part of a chain which is destroying the human potential and filling negativity in people. Rather, you can change this. Share love and compassion and also encourage people to move forward and payback to those who did the same with you.