As I have noticed, and was intending on expounding upon a bit. Think of how many teenagers you know. Now take that number, and think of how many of them play videogames and listen to most popular music.
Now, how many of those still would you believe to pick up an AK-47 and go shoot up half of their school?
Most teenagers I know play videogames. If not most teenagers, then by all means, nearly all male teenagers. And of course, as teenagers do, we play the most modern games, those fresh from the companies that pump them out. Let me tell you some of the names, with brief descriptions, of some of the hot videogames many of the people I know are playing.
Counterstrike - a spin-off of the Half-life series, this is a multiplayer first-person shooter. You divide into two teams, Terrorist and Counter-Terrorist. Obviously, the two are against each other. The easiest way to win? Kill all the other guys. The game is perfectly bloody, and in fact, you can get a rather nice view of someone's head being taken off by a 12 gauge shotgun.
Mortal Kombat: Deadly Alliance - though I've not played the game myself, the Mortal Kombat series is infamous for its bloody fight scenes, particularly the special moves each character can do at the end of a fight known as Fatalities. These generally consist of things such as burning your enemy into a crisp, ripping their spine and skull from their carcass, punching through their chest and devouring their still beating heart and so on.
Halo - a 1st person shooter, you're a cyborg super soldier carrying your ship's sentient computer. A lovely jaunt through space in which you get to blast a ton of aliens, with real alien blood spraying action.
The list goes on. I myself have played two of these games, and enjoyed them thoroughly. I've enjoyed other games with brutally violent combat. I'm also a pacifist, and have been all my life, though perhaps I did not know the term during my childhood.
Hunter: the Reckoning - this X-box game pits you against hordes of zombies and other horrors of the night, even including a psychotic possessed teddy bear that tries to hug you to death before it pukes acid on you. The intro scene to the Teddy fight has the bear brutally slaying the parents of its former owner (a little girl) before her very eyes.
My point is this. Nearly all teenagers have played videogames, and nearly all of those that have played videogames have played violent ones. Many of these do not just put a game down after finding its violent content. Videogames did not make those people go out and shoot their classmates. Neither did explicit lyrics in music, though perhaps that is a better arguement than anything one could try to pin on videogames. Those individuals killed their peers for whatever reasons. Most of them were mentally deranged. In many cases, they were picked on by classmates, something that I believe is far more dangerous than any videogame.
As for music, this is a harder thing to defend. Most popular music, except for some rock and some rap, don't have very violent lyrics. Even then, most teenagers I know can differentiate between a song and reality. When Eminem raps about killing his wife and stuffing her in a trunk, such as in his song 'Kim', most teenagers know that, "Hey, this is a song. Eminem is an artist that lives on controversy. Thus, he's controversial."
There are exceptions, I will admit. In fact, Eminem's own song "Stan" is about a fellow who takes the music too far. Eminem sings as the character Stan, a fan of Eminem who becomes angered and obsessed when he receives no reply to his fan mail. The song ends with Stan driving his car off a bridge with his girlfriend tied up in the trunk, killing the both of them.
I think perhaps music can have a greater impact than videogames because..well, face it. No one wants to see videogame designers. Very few people idolize the makers of their games, though a few hardcore fans may know the name of the person behind a long series of games or such. Not so with music. Anyone, even someone not a fan, can probably point out an Eminem song on the radio. We see the artists and musicians all the time, whether on commericals for clothes, or food, or even in their own movies. It's easier to believe, "Hey, this person has big world influence. If he says he's doing something, it surely can't be too bad, right?" than when you're dealing with a disc and a computer.
As I have said however, my defense was more of videogames than of music. The point of my French leaders to ailurophobia analogy was that one should not be so quick to blame something for a person's actions. Maybe videogames DID have an impact on those gunmen's actions. It is more probable that they did not. It could be like saying that I got in a car wreck because I bought a Big Mac a week ago. Maybe the Big Mac had some bad meat in it, so I became sick, and had recovered enough to return to work. However, I was still woozy, and didn't correct in time to avoid hitting a car that swerved out of my path. In some minor, round-about way, it may be in some part the Big Mac's fault, but it is also mine. I shouldn't have tried to drive if I was still feeling sick. As such, I should take responsibility for my actions.