Flash forward to 2020, in which the Nuclear Deal has been destroyed by Trump. Iran is again enriching Uranium with no agreement restrictions imposed, and reports indicate they are actively pursuing hostile acts around the region. "Proxy wars" in other words, in order to counter-balance the American attention.
Meanwhile, the biggest problem might be the Ayatollah. Shiite's believe their clergy are anointed prophets, like a Messiah for the current age, and anything the Ayatollah or the Imam might say, has the weight of Allah/God behind it.
He could in theory decide to nuke a country and claim God told him to do it. Meanwhile, his religious followers would be bound to believe it was the will of God, and not just the will of the one man. I note in the Quran, there is so much of "we" like the prophet is speaking with God, and the Shiites give this same authority to their religious leaders, whomever that might be at a given time.