Except it was Dylan and Eric doing the bullying. They felt themselves above the jocks. They wanted everyone to die, not just a certain group. They'd already been turned in for crossing the line of mere bullying to physical confrontations and threats of other kids.
Good post. That's what stood out for me about the Klebolds' claims of bullying. It was their son who was the bully, not the bullied. Chris Rock had some routine about Columbine, and he was pointing out that Klebold and Harris, who were supposed to be so downtrodden, had more friends at school than he did growing up!