Personally, I don't think of martial arts as a means of self defense, and particularly not when you're defending your family or others. So, I carry, and I have very effective defenses staged in certain places around the house.
Martial Arts are only effective if someone who knows MA challenges you to an MA fight. Is that ever gonna happen here, or while I'm at an ATM or walking through a park with my beautiful wife or granddaughter? That's a big No.
But I do believe our special military forces still learn it, and that it can come in really handy for them.