Iran: The Control

There is no political "Big Bang" to define the existence of international order. 
The main objective of appearance of Iran's nuclear case and then the nuclear deal has been the key world of "control". It is evident that Iranian nuclear program has been always a pretext. Tehran is a good player that plays for a bad side, which makes it a de facto threat but it might also be considered a potential opportunity in long-term. 
A sudden and total withdrawal of the nuclear deal by the U.S. can drive everything in this regard out of control, which is against the primary goal and even the true will of the White House. It cannot be denied that the current nuclear deal could not fulfill the mentioned demand and purpose, but it can be used as the board of a game. 
Unlike a big explosion, an engineered explosion can guide the subject and take any side effects under the control. If the simple purpose are correcting and guiding the reactions of Tehran, the Washington should gradually withdraw the deal, whereas it supports the action by carrot and stick. In fact, partial withdrawal of the nuclear deal would performs as a game that should be implemented by the means of rewards and punishments in order to finally break the resistance of the counter side.