“You act as if the Iranians are invincible and the West has no way to deter them.”
Not at all.
The Iranians would live a short, but exciting life under sustained US attack, especially if augmented by allies in the region.
However, should there be any delay in neutralizing their capabilities, they will be used, and used to great effect.
Iran has the ability to completely shut down Gulf oil shipments/production for a limited period of time. Some of that infrastructure would take years to rebuild.
Thus, the delay as the US wrangles with allies who would rather appease.
And just who would those "allies in the region" be?
The same ones who fought with us in Iraq?
Thought so.