So then, since it is obvious that none of the regulations being discussed would have prevented this accident, lets look at Lanz. Sure, he shot allot of bullets, but considering it took the cops 5 minutes to get there, how would any aspects of the bans and background check stopped Lanza from killing those kids ?
Again: Loughner was only stopped in Arizona when he had to reload. Someone grabbed the magazine.
Lanza shot 152 bullets in 5 minutes, and killed himself when the police arrived. If he had to reload 14 times, a) someone may have been able to intervene (what if he tried to shoot a teacher, but was out of bullets and had to reload), and b) the additional time could have made him kill himself when the police arrived after only killing 15 children instead of 20.
He shot a door, reloaded, went into the office, shot some people, reloaded, went into a classroom, shot the teacher and all the kids, reloading a couple of times, went into another classroom, shot another teacher and some more kids, again reloading a couple of times, and then shot himself. If he had been restricted to 10 round mazines there would have been exactly 0 fewer casualties.