"Many Iranians are well disposed toward us. On 9/11, there was dancing in the streets in parts of the Muslim world but candlelit vigils and mourning in Tehran. When we invaded Afghanistan, Iran helped us, especially in our dealings with the Northern Alliance. Hoping for better bilateral relations, Tehran wanted to join us against al Qaeda. The CIA and the State Department supported this partnership, but some in the White House and the Pentagon did not. After President Bush included Iran in the "axis of evil," everything went downhill fast."
When you understand the behavior of sovereign states through the perspective of a bunch of high school kids, you are liable to swallow anything.