Why do you say "had"... MAD is still around. There might be less fear about it in the media, but the danger is still present. As defense technology matures, it

Why do you say "had"... MAD is still around. There might be less fear about it in the media, but the danger is still present. As defense technology matures, it might make nuclear war winnable for the side that controls a sufficient nuclear defense. Or it might not.