I'm sure Moms Against Fun will come out and claim he liked the movie too much.
This was my first thought too.
Censorship advocates will point out the "terrorist themes" influenced him. They will ignore that the shooting occurred before the showing began...anywhere in the world.
Gun control lobbyists will again use this as a platform. They will ignore that this
and Columbine occurred outside of Denver, CO. A city filled with hippies, and with one of the strictest gun control laws allowed by the US Constitution.
Over-protective mothers (outside of Aurora, CO) will use this to tell their teenaged son, "See! I told you not to go to this thing! I told you nothing good can happen after midnight!"