Actually the individuals carrying out these mass murders are actually untrained law abiding citizens. The Theatre gunman, Tucson Shooter, Columbine High School, Oregon Mall Shooter, & Sandy Hook School Shooter all had zero rap sheets not even a traffic violation... So the reason we need these assault rifles out of our communities is because there is absolutely no way to know who is a threat. It will not stop these sick individuals from carrying out acts of violence but at the very least it will cut down the death toll by not arming them with fire power intended for war zones.