Nuclear Chess, or Nuclear Chicken?

"So, here's the big question: If diplomacy is the only rational solution to this problem yet the Iranians just want nukes -- in other words, if there is no deal (or at least no deal that the United States would realistically offer) that would compel them to give up their dream -- what's the next step?" Slate's Fred Kaplan admits to being stymied on the troubling question of Iranian nukes.