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Dylan Klebold and Eric Harris, the two teenagers who carried out the 1999 Columbine High School massacre in Littleton, Colo., were fervent "Doom" players. German 17-year-old Tim Kretschmer killed 15 people a decade later with moves he stole from the game "Counter Strike." When youths engage in violent behavior, the brutal video games they played before they committed their crimes are generally cited as reasons for their tendencies. Logic simply follows: Violent video games make kids violent.