Let's stop fixating on "bump stocks" and focus on the use of weapons. Why would anybody, other than an academic collector/expert or member of the military, want an automatic firearm? Why would you give them one if they have not provided a credible reason, duly motivated and verified to a satisfactory degree, to possess any firearm? South Africa's firearm laws are strict yet workable (in the absence of an incompetent, corrupt, politically manipulated police force). The US would do well to consider our case and learn from it; that said, don't fixate on firearms, nowadays even cars and trucks and commercially available chemicals are being turned into weapons of mass murder. We need an effective police force and effective intelligence services directed at criminals, not the law-abiding general populace, as well as an effective and impartial justice system, to help protect us from this menace, as, clearly, does the (once) mighty USA.