"I think Klebold and Harris being bullied has been debunked. They were just a psychopath and a suicidal follower."
No, it hasn't. Read the "Crime" chapter of Andrew Solomon's Far From The Tree. I don't want to speak for Harris, but it is very clear that Dylan Klebold was the victim of relentless bullying.
Edited: To clarify my point, I think in the case of Harris, yes the consensus is he was a psychopath; I don't believe that is true about Dylan.