Local paper reported today that the kid allegedly had two earlier instances of pulling knives on people and threatening them, but for some reason, his record was expunged well before the massacre:
http://deseretnews.com/dn/view/0,1249,660196477,00.html
I think he was influenced by somebody else, that is, by his mullah or some other Islamic "spiritual leader." He obviously had problems, but so did the Columbine killers; the parents of one of them had been trying to get their son into the care of a psychiatrist or a psychiatric institute, IIRC.
Of course, the press analyzed every word the Columbine killers said, every website they visited, every video game they played and every person they knew. That's fine. But why is the same thing not happening in this case?