I would agree that violent video games and certain films are partly responsible for this shocking plan. In fact, I believe it only takes one in the group to indulge in the former and influence his friends to cooperate and execute such plan of attack. I'm completely flabbergasted.
Or maybe they were raised on Lord of the Flies? It is too bad that video games, music, and television usually take all the blame for things like this. Literature wants some action too!