One very simple reason, MAD, Mutually Assured Destruction resulting from a Nuclear war relies in large part upon those involved understanding the finality of the destruction that even the Marxists of the Soviet Union and even to Norks under the Kim Dynasty can grasp in that being dead is a rather formal state of nothing.
Where as the Mullahs and their followers, totally indoctrinated as revealed with a suicide Bomber have the image of “Paradise” to look forward to and do not see dead as in John Cleese’s Norwegian Blue Parrot as the reality.
Therefore Those Mad Mullahs will have no concept that leaving a nuclear desert as the result of an exchange with Israel is of great concern as Paradise awaits them having done Allah’s will as directed in the Koran.