I don't know what the chances are of one ever needing to use their weapon in self-defense, but let's say that it's 2%. Pretty small odds that you will ever have to defend yourself. But we know that it happens. So, if someone finds themselves in that very small 2% they're either going to have a weapon or wish they had one. Statistics don't matter when it's happening to you.
Seems to me that the same rule applies with the ability to stop an attack. Your chances of being confronted by some crazy on PCP, a gangbanger, or a meth-head is pretty small, but if you find yourself in that very small percentage, you're going to either have sufficient fight stopping capability or you aren't.
I believe I'll err on the side of caution.
Jeff Cooper said something to the effect that he didn't choose his carry weapon to be comfortable, but comforting.