Many things contribute to this situation. The popular culprits to blame are violence in the movies and on TV, video games, the preponderence of guns, drugs, the Internet and busy parents. Millions of children are exposed to these things but only a few shoot their schoolmates and teachers. In the final analysis, children shoot up schools because they decide to do so. Regardless of whether they are treated badly or well, children are the prisoners of their parents and their schools.
Schools are prisons, to which children are sentenced by compulsory education and truancy laws.
There is no mystery why it took the cops two hours to act after the shooting had stopped. Cops have less courage and freedom than an ordinary citizen. You or I might have rushed in and shot it out with the bad guys but cops have to wait for orders, and orders have to wait for commanders. Commanders have to wait for SWAT teams, and SWAT teams have to wait for the Bomb Squad . The Bomb Squad has to wait for the sniffer dogs, and sniffer dogs always wait for Channel 9 to set up their satellite truck, to transmit dramatic live publicity of the operation.