Here is your proof of how pro-US they are. Here a few Iranian--as well as children from other nations--do the "Death to America thing":
Footage of Brainwashing of Muslim Children
I don't really believe they are pro-US at all. They may be pro-US money, but that seems to be about it. I work with a handful of Iranians in my lab. Two of them have said that the US deserves to get hit by terrorist strikes and another says that he sympathizes with suicide bombers. All of them hate Israel. Only one of them acknowleges President Bush as our President (and this is something that really angers me, to the point that I've called out little old ladies over it. You don't like the President, fine. You disown him? You're a sorry excuse for an American.)