I agree and most people have the self control and the knowledge they would spend the rest of their life in a concrete cell that prevents them from acting on their emotions. I think most murders are out of pure anger and loss of self control and I hear that more common on the news. Someone pisses another person off so badly that the person who is angry pulls out a gun or knife and kills the person in revenge. I think that is way more common than the premeditated murder due to psychopathic behavior.