If you think the U.S. is isolated now, wait till that happy event occurs. Add to that Iran’s stated intent to rid the world of Israel, and its reason for having nukes is clear. The Center for Strategic and International Studies reckons an Israeli-Iran nuclear war would kill upwards of 800,000 Israelis and perhaps 20 million Iranians.
Meanwhile, Iran’s rivals, Saudi Arabia and Egypt, say they won’t stand by as Iran develops nukes. They too will build some. More millions dead.