Actually, the guy himself said he was doing the killings because no girl would have sex with him. Instead of figuring out what he might have been doing wrong, he decided to shoot females. I don't think the DUmmies' interpretations are that far out of line here. They pretty much match what the killer said: he hated women for turning him down and hated the men that could get women to have sex with them.
I agree. It's misogynism mixed with mental illness. Bring back the state mental hospitals.