considering how close to the edge of extermination we already have been brought, calling MAD successful leaves a real bad taste in my mouth.
Also, think of all the past plausible/likely bad scenarios that MAD averted, such as involving the Soviets.
I sometimes joke about a utopian future of humanity, all peace and love, for thousands of years... until we encounter malevolent space aliens. Humanity had lost the ability to even reason about such a conflict, unable to imagine many options. Fortunately, humanity had maintained the cryogenic suspension of Kissinger and other historical figures capable of cold-blooded ruthlessness. And there was a Thaw button. (In some versions of the story, as soon as the anti-dream team wakes up and starts talking, we decide they're even worse than the space aliens.)