No, hence the OP statement that nobody was available to prevent 4 folks from being shot at barber shop-car wash is, in my opinion, a bad premise to support the argument that since 4 people were shot we shouldn't allow good guys to be armed, as they're not effective enough to prevent every shooting - at least that was my take on the OP, maybe I misunderstood.
I used to think it was terrible that life was unfair. Then I thought what if life were fair and all of the terrible things that happen came because we really deserved them? Now I take comfort in the general unfairness and hostility of the universe.