MAD worked against the Soviets because they were basically sane - by or standards. The goat humping cult over there is not. They are ready and willing to die a glorious death in the name of their ... whatever. If we want to remain reasonably safe we have to be able to shoot down anything they may launch at us. Deterrence won’t work.
they need to have a serious nuclear explosion /accident at one of their facilities and we shall then see how willing they might be to meet martyrdom in such ways . Something about masses of deep fried people disavows such fantasies .