Wait, let me dig out my tinfoil hat before answering. :P
Oh, I think he was a nutjob all right, and not an agent of the Islamic terrorists or an agent of the Neo-Nazis. But, he does have definite symbolic references in his stuff, so it’s something to be aware of. Who knows, at this point, what his twised mind was thinking about when he shot up all those students. We’re starting to get an idea of it, but we don’t know all of it yet.