The "vicious circle" in the nuclear sense the unending quest for "security" and "stable deterrence" can be "broken" only in one of two ways: by setting the weapons off, or else by getting rid of all or most of them. And insofar as a genocidal system moves strongly toward weapons use or perceives its adversary to be doing so there is a powerful temptation to set off one's weapons quickly so that the command-and-control structure of the enemy, rather than one's own, can be destroyed.
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