Now is not what matters. The world will be a much better place in 10 years
Can I borrow your cystal ball?
It hardly takes a crystal ball to figure out the world would be a much more dangerous place had Iran been allowed to develop nuclear weapons and ICBMs.
They were getting dangerously close to both. They already had missiles capable of striking every capital city in Europe and had enriched their uranium to 60%, far greater than anything needed for peaceful purposes. It was only a matter of time, and probably not very much time, before they had the capability of striking the US with ICBMs with nuclear warheads. The greatest danger the world could ever face is a radical regime who advocates for martyrdom having the capability of striking anyplace in the world with nuclear weapons. Mutual assured destruction would have little effect on such a regime. Their country is being systematically destroyed and still they refuse to capitulate. MAD won't deter madmen.