I don’t think an unarmed nut has much of a chance at killing a lot of people by going into a police state and trying to take gun from a cop. If a nut tried that, he’d probably be stopped very quickly by other armed cops.
But would still have an opportunity to kill people. There’s no guarantee he would be dropped before taking the opportunity to fire several bullets into the bodies of nearby officers.
True, but could he kill 17 people and wound 14 more? Doubtful.