In case you haven't noticed, the world is full of people WITHOUT a hint of intelligence. I suppose after the dead and wounded got carted away and their families wanted to know why, you'd just tell them that they should have had a hint of intelligence.
Yep. Nobody other than law enforcement and the military should even carry firearms.
In which case they'd just be replaced by NEW CRIMINALS to stuff in jail after the damage they cause is already done. How much more in taxes are you willing to pay so that more jails can be built and staffed in order to keep them all locked up for life?
(Hint: think before you post.)