I was just thinking what if literally everyone who could CC did CC?
If it were ever the case, I'd bet that ...
A percentage of violent criminals would realize they're almost sure to meet deadly armed resistance to any violence the present, and they'd take pains to counter that degree of resistance. How are you going to keep this from happening, amongst the most-violent? It would happen, sure as sunshine, with some of them. If sure to meet deadly resistance, anything that can counter the resistance (ie, taking out the "gunners" at the outset) would be a good move, raising the odds for success.
A percentage of violent criminals would realize the game was up, and they'd head for greener pastures, to find some other avenue of resistance with a better mix of rewards/penalties/risks.
A good percentage would be permanently erased from this world, as a heavily-armed, continuously-armed citizenry expressed its flat refusal to be violated, increasing its resolve as more folks resolved to not be victimized. I'd bet this would also strongly change the courts, DA's, attorneys, changing their perspective on "castle" realities, that all citizens have every right to stand their round against any and all unprovoked violence against them at all times, wherever they are.
And some small percentage of so-called upstanding citizens would find it within themselves to turn. (After all, criminals come from somewhere; they come from us, who've turned.)
What would those percentages be? Who's to say?
IMO, it would be far better, if all upstanding people had every capacity to effectively defend themselves against predation. With this mix, the likelihood of the criminally violent surviving very long in the game would be dramatically reduced. Hard to argue that's not a good thing.