I think that Morgan Freeman is entirely right about what is motivating these killers
"You want to know why? This may sound cynical, but here's why. It's because of the way the mediar reports on it. Flip on the news and watch how we treat the Batman theater shooter and the Oregon mall shooter like celebrities. Dylan Klebold and Eric Harris are household names, but do you know the name of a single victim of Columbine? Disturbed people who would otherwise just off themselves in their basements see the news and want to top it by doing somthing worse, and going out in a memorable way. Why a grade school? Why children? Because he'll be remembered as a horrible monster, instead of a sad nobody." . . .