Washington should make a cold calculation, however, about just what such a weapon will do for them. It certainly does not solve their economic problems, nor does it silence opposition protesters in Tehran or ethnic separatists in the provinces of Baluchestan, Kordestan, or elsewhere. Nor does a nuclear weapon help the Islamic Republic counter what it claims is the main threat to its survival: a covert war of “soft overthrow” waged by its traditional enemies in the West.