If you’re talking about the Neo-Nazis being a reviled subculture, yes..., I would agree with that. I don’t think that he was a member of that subculture. And, I don’t think he was an agent of the Islamic terrorists (like some on Free Republic are thinking). But, he did gather a lot of stuff from the Internet and apparently read a lot from the Internet, too. I say that because he wasn’t talking to his classmates and neither was he talking to his dorm-mates. They said he spent a lot of time on the computer.
Knowing that there are all sorts of garbage sites and stuff out there on the net, spouting off all sorts of hatred and crazy ideas, it’s more than likely that this guy gathered all this kind of symbolic material up from the Net and used it as a sort of justification for his own twisted thinking.
So, in that way, it pays to be aware of what these symbolic links are that he’s provided throughout his stuff...
A decade ago, I spent a lot of time online debating nazis. It lost its charm after a while. But if I wanted to mimic their rhetoric, it wouldn't take any effort -- and even without that history, if I wanted to hit some of their high points, it would only take a few minutes at Stormfront.org to suss out the memes. It isn't as if there's anything clever or complicated there.
I know some people are making fun of your observation that this madboy (I won’t call him a madman) absorbed anything negative he could find. He probably picked up garbage from many sources — anti-American moonbats, neoNazis, Islamofascists, etc. Obviously he did not have a coherent world view but he thrived on hate wherever he could find it. A lone nut could pick up a lot of garbage like that and that does not mean he was a member of any group or was involved in some conspiracy. I have long said that if one fills one’s mind with garbage, one will become garbage. It would not surprise me at all that a criminal known for sadism and mass murder would identify with the Nazis.