Sexism is the foundation on which all tyranny is built. Every social form of hierarchy and abuse is modeled on male-over-female domination.
Men are rewarded for learning the practice of violence in virtually any sphere of activity by money, admiration, recognition, respect, and the genuflection of others honoring their sacred and proven masculinity. In male culture, police are heroic and so are outlaws; males who enforce standards are heroic and so are those who violate them.
Institutionalised in sports, the military, acculturated sexuality, the history and mythology of heroism, violence is taught to boys until they becomes its advocates.