Um. They didn't flee the Shah, they fled what followed. And not all of them fled when/before the Shah fell, either. Among my Persian friends and acquaintances is one who fought in the Iran-Iraq war, before he escaped the present tyranny to come to the US. He bears (you can see them) psychological scars, but his children are growing up free and he is happy for that.
(I could read between the lines and say he'd be happiest if his children could return to a free Iran, but that would be putting words in his mouth.)