My personal opinion is that video games do trigger violence in children, but I did some research so I hope this helps...
Much of the research on violent video game use relies on measures to assess aggression that don't correlate with real-world violence. Some studies are observational and don't prove cause and effect.
Federal crime statistics suggest that serious violent crimes among youths have decreased since 1996, even as video game sales have soared.
Parents can protect children from potential harm by limiting use of video games and taking other common-sense precautions.