It proves that gun bans do not equate to reducing violent crime. Throw in the fact that law-abiding citizens can arm themselves against criminals who don't care about laws, there is sufficient evidence you can curtail the threat of crime, as what has occurred in Detroit. The fact we have what is essentially a total drug ban and major drug epidemic in this country should cause folks to deduce that reducing legal access to firearms will do jack squat here. Gangs, robbers, and mass shooters will get their hands on weapons regardless of a ban, just like junkies will spend 20K on the corner to get their high.
Conglomeration of reasons, one of which is overmedication. Unfortunately, I know a lot of people now, including family members, that struggle with anti-D's and other types of drugs. It really does cause them to make irrational decisions.