Is Iran suicidal or deterrable?

By The Economist | NEW YORK

THE question in the title of this post is crucial, since both America and Israel possess large nuclear arsenals. If Iran does not care whether it is destroyed (say, so long as it can destroy Israel or New York in the bargain) then we are looking at a lunatic state we should take virtually any step to stop from becoming nuclear. If Iran is not suicidal, though, Israel's and America's nukes change the calculation dramatically; this would still not make nuclear Iran a good thing, but it would make it less than the end of the world as we know it.