Americans wanted to blame everything but Columbine High for the massacre- they blamed a violent media, Marilyn Manson, Goth culture, the Internet, the Trench Coat Mafia, video games, lax gun control laws, and liberal values.
At Columbine, parents and students both felt that bullies were favored by teachers and administrators, and that complainers were often ignored or blamed. Indeed, losers pay for being losers twice over in our schools, taking both the punishment and the blame.
Even Hitler is given a context by serious historians- the humiliation of the Treaty of Versailles and the failure of Weimar Germany- whereas rampage murderers, like slaves once before them, are portrayed as having killed without reason.