Well, I would characterize persons who would seriously consider going to war over Iran's nuclear ambitions as exceptionally foolish or maybe strongly motivated by something other than what most sane people would consider reasonable cause. But I wouldn't necessarily characterize them as mad. Look at the Iraq war.  Was it the result of ignorance coupled with greed, foolish misadventure, revenge, insanity, misplaced concerns over national security, or a combination of these things?  I haven't quite made up my mind, as some have here, but I lean these days towards a combination of these things that were present in varying degrees in those who argued for war.

I guess you could say that "leverage" includes deterrence, although it will be a long long time before Iran's capabilities would be seen as constituting a credible deterrence.

I can swear there ain't no heaven but I pray there ain't no hell. _ Blood Sweat & Tears