Sure. But I was talking mostly about Afghanistan. And the US got 'impatient' with the Shiite/Sunni fighting in Iraq. And the Shiite yelling and screaming, "Death to America" from Iran is difficult to respect.
For the connection between the clerics and the economy in Iran, there was an article in, maybe, 'Forbes' long ago explaining that basically the clerics get a 'cut' of nearly everything in the economy, control who gets to do what, etc.
But, why? That is, why are the Islamic clerics in Iran running the economy with a short leash and running an aggressive military and foreign policy at great cost to their domestic standard of living? Is this just religion? No. But Islam is not just religion and, instead, is often also economic, legal, military, foreign policy, etc. That's not new: The Roman Catholic church was doing that in Europe for hundreds of years. They owned a major fraction of all the farm land in France which has a major fraction of all the good farm land in Western Europe. They built little things like the cathedrals, while the people were living in, what, mud huts? They built the Bishop's Residenz in Würzburg, awash in some of the fanciest art and architecture in all of civilization -- not cheap, and built by citizens in, what, mud huts? The Roman Catholic church was running everything. E.g., to be a king, had to have the Pope tap you on the head or some such. And they were corrupt. So, they had the Protestant Reformation, religious wars, etc. Lots of blood. Finally they learned their lessons about religion. In the US, we borrowed those lessons -- the state will establish no religion; there will be separation of church and state; there will be freedom of religion. Done. Iraq, Iran, and Afghanistan still have to learn these old lessons.
Sorry about the Shah; he was a pawn in the Cold War. The US had just finished WWII and, thus, took the Cold War seriously. We spent a LOT of money, and blood, winning the Cold War.
Iraq, Iran, Kuwait, Saudi Arabia, the other Arab oil states, should all do the same thing: Cool down. Relax. Embrace peace. Get the clerics into religion only. No more clerics measuring the lengths of women's skirts or censoring the Internet. Pump oil. Enjoy life. Then work on culture, good government, education, technology, and a strong economy for when the oil runs out. And stop shouting "Death to America". Want nuclear power for electric power, taking the salt out of water and growing vegetables? Fine. Just accept the usual international rules, safeguards, and inspections, and light up your cities and have fountains and big swimming pools of pure water.
All this fighting is over nothing, wasteful, and absurd.