A young person walks into the high school cafeteria and opens fire.
Boys dressed in combat fatigues spray a schoolyard full of children and teachers with gunfire.
These stories are becoming all too frequent. There are no simple explanations for aggression and violence, and psychologists are struggling to understand violence among youth. One hypothesis of aggression is the frustration-aggression hypothesis. According to this hypothesis, aggression and violence can result from being prevented from reaching some desired goal. For example, some news reports have claimed that a recent shooting rampage resulted when one young man was jilted by his girlfriend.