>>508172090North Korea (the closest analogue to Iran in the countries you listed) has nukes, it is not BUILDING a nuke. Once they actually have them, that's that, you can't do anything without risking one of those landing somewhere you don't want and wiping out 5-7 digit sums of human lives, billions to trillions in financial losses, and the incalculable risk from any
critical institutions paralyzed or completely destroyed in the attack. You can stop them before they get to that point, though, and Iran is a clear and present danger to America as long as Iran maintains their current leadership and we maintain our current alliances. It is what it is.