Acts of aggression, or physical or verbal behavior intended to hurt someone, plague human interaction. There is no real agreement on the cause of human aggression. what do you think explains the high rates of aggression and violence, particularly in the U.S.? Is aggression instinctive, just part of human nature? Are some people "born" aggressive? Does aggression come from biochemical influences like testosterone or alcohol? Is aggression caused by frustration? Media influences like violent TV programs or movies?