Psychologist explains how violent games make kids think it is ok to be aggressive

Public debate on the effects of violent video games can become especially contentious in the wake of a rampage shooting, such as the recent killing of nine people in Munich. If it is later discovered the perpetrator was a fan of violent video games, as was the Munich killer, it is tempting to think that perhaps violent games'caused' the rampage shooting. But rampage shootings are rare and complex events caused by multiple factors acting together. One can't accurately predict a rampage shooting based on exposure to violent video games or any other single factor. Laboratory experiments are used to make firm and causal conclusions about violent video game effects.