MAD isn't a principle. It's an effect. The actual principle is Assured Destruction. It's just that everyone else also follows the same principle: we want to be

MAD isn't a principle. It's an effect. The actual principle is Assured Destruction. It's just that everyone else also follows the same principle: we want to be sure of being able to destroy our enemies. We might also see airborne alerts resume (bombers flying around with nukes ready to avoid being caught on the ground)