why we can't stop proliferation(for now at least)
I think that basic faults in human nature are the cause for war. ie greed, jelosy, maniac suicidal kill everyone when you go down syndrome, and others.
so the MAD idea of deterance only works so well, there are always people who are crazy and don't care about human life, their own life or the survival or the Human race that will always hurt others and nuclear wepeons magnify their threat.
Unfortunatley in our current state, we(the world) are not goingto beable to stop all wars. The countries, peoples, religions, etc of the world are too different and uncopatible and are naturally antagonist toward each other. the only way to stop all war (or at least most of it) would be for Humanity to unite, either by itself(unlikely) or in the face of a overarching world ending problem, sucha as a world ending asteriod, massive and claticlismic war, the destruction of the environment, or even an alien invasion

(very, very unlikely but still thought provoking). unforunatley the world seems to be heading more toward the seccond set rather than the first.
other than that, the only way to stop the main threat of world-ending nuclear war would be to create some kind of space based global defence against misslies. that still wouldn't stop single, portioble nukes being used by terrorists.
there that what i think about that, just kindof joind this thread so I am not shure how relevant to it this is.