This is a good topic, I´d like to see the discussions here regarding this. We had a mad man in the Mexican Subway systrem start shooting randomly at crowds, and 50 people were behind him, walked away, even police officers ran. ONLY ONE guy gave him the face, and got shot several times, when people saw his valiant response, reluctantly others got involved. But this IS indeed something to say about society, that we don´t want to defend our fellowman. We want the guys in the Army to do it for us.
Seriously, do you think many military vets are going to watch batman? That's the group i would expect would try to do something to the shooter.
I read here on FR that one of the male attendees ran and left his baby, fiance, and her child. Of course that's another sad comment on society: Parents taking kids to a movie at midnight, and children without their natural father being married to their mother. What a sick world we live in.