Have you lived in Iran? It's not a whole country of 90 million people who will shout "Push the button!". Most of them are unwillingly imprisoned under a regime lead by the religious zealots who will push that button, even if it means destruction of themselves and their population. Or at least, that's the assumption that the west must make, based their religious views and their past rhetoric.

Which is their past rhetoric?

As for their religious views, hasn't their supreme leader declared multiple times that nuclear weapons are prohibited by their religion?