The fearmongers would have you believe Iran would nuke Israel the day after acquiring the Bomb, and the pants shitters believe them.
It's bullshit. Iran wants a nuke for the same reason every other country wants one; as a deterrent. And the more we chant "bomb-bomb-bomb Iran", the more they want that deterrent to ensure the Great Satan will never invade.
We lived with a nuclear USSR, and made treaties with them even though they constantly violated them and rattled their sabers at us and threatened global thermonuclear war. The USSR was an existential threat to the US. Iran is not.
We lived with a nuclear USSR because we knew the more righteous would triumph in the end. So it will be with the theocratic regime of Iran. They will fall one day, and we will be there dancing on their graves.