The biggest problem

This is why teachers are having such a hard time at school. This young man has obviously never been taught tolerance, he clearly only knows intimidation and mindless violence and has absolutely no fear of the consequences. 

The quote that really terrified me was this "when Harris was initially interviewed about the assaults he was 'laughing and joking' with his mother." How are teachers supposed to teach these kids anything when their parents maintain this kind of attitude?