movies, videogames, books and guns are not the culprit. the guilty party is an unstable little boy and the family that let him down.
Then how do you explain the fact that here in the U.S. we have a murder rate on par with countries like Columbia, instead of places like the U.K or the Netherlands? I've never heard or read about some teenager going on a shooting rampage in in western europe. The last one I heard about was a few years back in Scotland where some adult male went beszerk and killed some little kids at a kindergarden class.
In the past year I can list several shoots where multiple people were shot and killed.