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.
Using schools as institutions for social control makes them de facto criminal-psychiatric facilities, depriving children of liberty and, in some cases, labeling them with a psychiatric diagnosis in order to facilitate current and future social control. Fifty years ago, there was no drug education in schools. School personnel did not forcibly administer drugs to children, and children did not use or abuse drugs, legal or illegal. The main function of the public school is not education but social control. The result is that the schools are unsafe and test scores are dismal.