What do you see as an alternative? The size of Iran has been scaring us away for 47 years, but religious nuts with nukes is not something the world can tolerate.
Tulsi Gabbard, Director of National Intelligence, disputed the idea that Iran was close to getting nukes. The idea that Iran would use a nuke as soon as they got one is also questionable. We still have a large nuclear deterrent that would dissuade them from doing so, even if that were their goal. It’s certainly true that the “mad mullahs” don’t like us, but just how mad they are and just how much power they actually have are things assumed, rather than proved.