[ZX12R]

Rabid OWSer, enraged by director Nolan’s powerful anti-OWS message in the film, most likely.

That's an interesting theory, and quite possible. He could also have just been angry about the OWS ineffectiveness in general and went postal because of it, and the movie was the last straw.

[KentTrappedInLiberalSeattle]

Pegged it early on. I want credit, if it turns out I was correct. ;)

[floriduh voter]

His mom in San Diego KNEW it was her son as soon as she heard the first report. Thanks alot MOM for the heads up that your son had guns and explosives and was likely to go off. Single mom, no dad ever scenario? Anyway, his apt bldg looks like public housing.