
Have you ever been in a team deathmatch in a video game and it’s obvious you’re gonna lose? At that point you have two options: quit the game or try and take as many enemies with you as possible before you lose. Me and plenty of others prefer the latter. The US can’t risk Iran adopting a similar line of thought in a worst case scenario, especially if they have nukes. To Iranian leaders, it doesn’t matter if they go down if they can take “the Great Satan” with them.
You’re right, other countries have nukes and represent threats. However, Iran is part of a unique group that relies on hatred for the US and its allies as foreign policy. Furthermore, Iran becoming a nuclear power would upset the political balance in the Middle East in favor of our enemies, giving them much more sway to make more. And if they decide to launch one day, we might take out their silos, or we might not. Better to strike a deal now so we never get to that point.