Well, it sure gets more complicated. Religion enters the picture, sort of. And certainly not the normal kind. Whether or not this one is an Islamic terrorist, Islamic terrorists are watching and taking notes.
I'm starting to think it's unlikely that it's an Islamist, or a woman (refering to some speculations in another post).
Now I'd be looking at the victims to see if they had certain "markers"-crosses, fishes, bumper stickers, or lack of; clean cut, no piercings, hard working honest appearing types, etc. Random generally isn't, and this shooter is aiming at catagories of people he deosn't identify with. While that is probably most of society, what common characteristics or general catagories do the victims fall into? Some may only fall into "target of opportunity" but something perhaps could be gleaned?
Maybe an anarchist pissed that the protests are so peaceful now?