What is the main source of violence in a man from my point of view.

What creates a violent man?
It's the same oppression by society and environment in which we live which creates the oppressor, whether the subject is punished himself, calling his little value, or that pre-exist problems of life who believe masochistic and suicidal idea towards. These problems can be; child abuse, either parent verbally or physically assaulting another parent, lack of role models, influences (Media, Friends, Family. We must bear in mind that the bad vibes and aggression can be quite contagious depending on each person's mind), traumas take much of this. However, the natural or adoptive parents or guardians of the young take most of this. Home schooling should be as important as academic education, respect and understanding are the alternative paths to a violent situation.

For a well done society we need education, and for education we need to create interest in people for them to study and change their actitude towards knowledge, and a good source for this type of media is music.