I'm not a member of the NRA, but I'm fairly certain none of its members were unmoved by the Aurora tragedy. The position in defense of the Second Amendment is not one of valuing some abstract Constitutional right over the lives and safety of innocent people, but rather recognizing that the only people affected by gun legislation are law-abiding citizens.
Norway has a much more stringent gun policy than the United States. That policy didn't avert the tragic mass shooting perpetrated at the camp on the island of Utøya, last year. That gunman was already planning on breaking the law against murder, and thus had no qualms about breaking a law against gun possession. Then we can look at the school shooting in Pearl, MS, in 1997, when Assistant Principal Joel Myrick went to his truck to retrieve a gun, which he used to subdue the assailant without even firing a shot. Lives were saved by the use of a legally owned gun.
That doesn't mean that arming every citizen is the answer, any more than stricter gun-control measures are. There are no easy answers, no matter how much we wish it were the case.