Bullying starts with simple things. Even if it is just someone making fun of them. When kids feel bullied they feel like they have no one to talk to, not even adults. This is what I believe causes kids to have such out bursts that they result in violence. I believe if the adults in the child's life would try to become more involved, violence in the kid would start to decline.
With the extent that T.J went to I think that he should be tried as an adult because he shot five kids and killed three. He needs to be tried as a adult because he murdered three kids, and he should not just be let off for that. Also, I believe this happened because of him being bullied at school. Even though he did not go for a particular group of kids, I think he just had to let his anger out.