Well I guess if you stand by while your underlings invade and capture the US embassy in your country and then do nothing to end the crisis, you can expect the US to put anyone else in the region above you in terms of support. Especially when you allow the "students" to preach anti US rhetoric each day.
The US will oppose anything that you do, until the day you die.
And rightly so I would say.
As long as Saddam kept attacking Iran I am sure the US would never have even thought of messing in his affairs.
I figure the only reason Iran got away with what they did to the US (ie the only reason the US did not strike back militarily) is because the weakest US president ever (Jimmy Carter) was in power. Of course his action probably indirectly lead the Sept 11th as it showed the Muslim world that you can humiliate the US and get away with it.
Getting back on topic, when Saddam invaded Kuwait, probably the best friend the US had in the region everything changed.
Moral of the story?