"Here's my thought on that in a nutshell: Violent movies and videogames do not make people violent. Violent people are attracted to violent media. Of course, so are many of the rest of us, just for different reasons. I ended up watching The Matrix about 46,000 times--at one point on a three-day loop--for the book, and I shot nobody. If you want to talk about warning signs, don't look at the kid's taste in movies or his literary output--look at those two things in the context of his real-life behavior, which was already disturbing his teachers and classmates. Stephen King? A folksy, personable guy in real life. Quentin Tarantino? Full of energy and enthusiasm. Consequently, no one expects them to go on shooting rampages. The bitter, stalkative kid who won't even speak when spoken to, who also writes about bloody murder sprees? For God's sake, keep an eye on him.)"