But it can, at least partially. It can drastically lower the amount of shooters, meaning less police & civilians in danger, and the portion of criminals who still manage to get guns and shoot up something might do it with a pistol instead of an automatic rifle, which makes a huge difference and is a scenario police would need heavy equipment for.figuring out how they got the weapons is not going to stop them from shooting up whatever they intend to shoot up
rare cases (most often on a state level) Bradley's (These were seen after the Boston Marathon bombing and people really had a fit about this).