I think the motivation is the big deal. They have a military base 30 minutes away from the shooting. It's a movie so you have your crazed fan boys. The Right-Wing has been pushing the hidden liberal agenda of Bain/Bane.
http://www.hollywoodreporter.com/hea...-batman-350311
Also youngest victim is 3 months years old....someone brought a 3 month year old to a midnight movie.