Eric Harris and Dylan Klebold thought of themselves as misfits. School and law enforcement officials. They may have ignored some of the warning signs that the boys had displayed. For instance, the boys had made death threats against other kids and they apparently were obsessed with Adolf Hitler, Nazis, and death. The media and entertainment industries.
Violence is a feature of many movies, t.v. shows, video and internet games.
Young people may become accustomed to so much pretend violence, that real violence no longer seems to be so terrible. The gun industry. Organizations such as the National Rifle Association have resisted efforts to control the manufacture and sale of guns. Although the NRA strongly encourages gun safety and responsible ownership, the easy access to guns allows some young people to get high powered weapons, even if kids aren't legally permitted to own such weapons. Many parents spend little time with their children and don't effectively monitor where they're going, what they're doing, or who their friends are.