I know it’s been several years. Sue me. 
I’ve read that one of the things that motivated Harris & Klebold was their desire to exact revenge on those who had teased, bullied, persecuted, whatever them. So, among the victims, were there any people who actually had persecuted either of the two?
The offical report is [url=]http://www.youthandviolence.com/state_of_colorado%20Columbine%20Evidence%20Release%20&%20Investigation%20Report.htmhere, although I’m not reading it for you!
And FWIW, I vaguely recall one of the interviewees in Bowling for Columbine mentioning that yes, they did get a lot of stick. (No doubt a Moore-basher will jump in and say that Moore distorted that interview )
Here’s a good article from Slate:
http://slate.msn.com/id/2099203
That says, in part:
Harris was a clinical psycopath and Klebold deppressed and suicidal. The bullying probably had little (if anything) to do with it. What they really wanted to do was to kill as many people as possible, to top Oklahoma City as the worst mass-murder in the country. But you should read the article for the full story.