I've been back in Connecticut for roughly three months. I've seen the demonizing of firearms by the majority of local media (both newspaper & television). Recently it has been about displaying confiscated firearms, as if some magnificent achievement had been accomplished. It is disgusting.
There are clearly ongoing attempts to influence people into having negative perceptions about both firearms, and their owners. Institutional indoctrination I would call it. Propaganda, call it what you will. If it gets citizens to elect anti-constitution, liberty despising extremists that will wage a jihad against the rights of law-abiding firearm owners, then it is a strategy that is working for them.
I've looked at statistics that were compiled and published through organizations like the NRA, and GOA over the years. As logic would suggest, in areas of our country where more of the citizenry is armed, the per capita violent crime rates have declined.
The flip-side of that coin is in areas where the law-abiding have been disarmed, crime rates have gone through the roof.
So to propose an answer to your question in your final sentence of your post; if we were a Constitutional carry State where every citizen not a prohibited person could bear a pistol, the firearm violence might not happen in the first place. Criminals would fear the possibility that a potential victim might pull a pistol and shoot them where they stood.