Look, logically they should back off. It's not worth it. Hell, it's more worth it to buy a nuclear weapon secretly. The only sane option is to change course, even if you don't want to kiss the ring. Even if you want to attack US military assets, you have to give up on building a nuke.

I'm not convinced that the Iranian government is "Hitler in the Bunker" levels of delusional. They'll talk like their insane, but so do the North Koreans, and they can all actually face reality on the ground.

I don't know, personally, what their level of delusion is. I'd trust the American diplomatic corps on that.