I am sorry, I just dont think there is any way to reason with terrorist states.
There are some basics to running a state. Any kind of state. Any kind of state that has periodic popular elections will be somewhat constrained. Even Nazi Germany was constrained at first until what s'name became total Dictator. Iran's Iammadjohn is going to be there only for a while, and since the 12th immam thing didn't happen a couple days ago they are back to reality.