I will say this: the shooter was long gone by the time anyone got to him for help. And he is repsponsible for his actions.
That said most of these people (mass shooters) are bullied when they are young (now I was bullied until about 8th grade as well, and never have been violent, etc.) and he was seriously mentally disturbed. I liken it to a rabid dog, he had to be put down, but in a way it is sad that he didn't recieve mental treatment earlier, and if assessed to be untreatable sent to an institution.
Also, even though it is no excuse, we do need to talk to our kids about the seriousness of the mistreatment of their peers. Murders have been occuring at the hands of those who were picked on when they were younger as long as this has been studied (there were incidents that happened as far back as the 50s that I have seen accounts of in my studies, I am studying political science (pre-law)). If we were to treat each other better when we were younger a sick dog like this kid may have been in mental health treatment instead of shooting up the school. That being said, many kids are picked on and very few lash out, but maybe some of this may be able to be prevented. I'm just saying this kid was obviously sick, and personally I don't believe in holding hatred in my heart, and I do believe he is responsible but it doesn't stop the possibility that this may have been prevented.
Just my opinion, and I do agree that Glenn Beck went way too far, but usually there is some truth on both sides of the debate. I know this post will bring on probably many posts that heavily disagree with me, and I just want to say I respect all of your opinions and am looking forward to discussing this issue with all of you.