Sure if guns didn't exist, we wouldn't have gun violence. The question is: given that we have guns, what is the right form of regulation that would lead to better public safety overall? After all, there is meaningful evidence that guns are often used (even just presenting the gun, not actually firing it) for legitimate self-defense purposes.

I said nothing about borrowed guns. To my knowledge, most of those homicides are done with stolen handguns, and are used by people involved in organized crime in the most highly gun-restricted cities in the nation.