If Iran had developed a nuclear weapon, they would have scratched Tel Aviv. Israel would have responded in kind by nuking Tehran and there would have been a full blown nuclear exchange between them which would have had serious consequences not only for the entire Mideast but the entire world. Trump understood that which is why he went to war to end Iran's nuclear program. He understood there would be short term pain for the US but when he weighed that against the danger of a nuclear Iran, he made the correct call.
I still won't believe Iran is serious about wanting peace until I see the Strait of Hormuz opened and ships flowing freely in and out of the Persian Gulf. The question now is, what will Trump do if they renege again. I think Trump already know that.
I doubt that. They would be taking out sites holy to Islam and would kill many fellow muslims. When the US accidentally shot down an Iranian airliner during the tanker escort operation in the 1980s, Iran dod not retaliate via terrorism. They agreed to international mediation and agreed to compensation.
Iranian nukes would likely be used as a deterrent to Israeli aggression as well as aggression from Sunni Arab states. At least they enrich their own uranium, rather than stealing it from the US and leaving a toxic mess that US taxpayers are still paying to clean up.
If Iran was the big boogyman, why did Israel sell them F-14 parts when Iran held our embassy hostage. Why did Israel agree to provide weapons to Iran during Iran-Contra?