If Theocratic Iran Had Nuclear Weapons, Would the Fear of Mutually Assured Destruction Dissuade Them From Using Them?

Mutually assured destruction as a deterrent against use of nuclear weapons has undoubtedly been a crucial reason why they haven't been used. Would a nuclear Iran, if it continued as the present theocracy, be dissuaded from using nuclear weapons because of the fear of reprisal? It's a critical question.