I think your criticism of the USA's trenchant hostility towards Iran is well made. I would posit that the reason for the hostility is that the USA (in its imperialist form) wants to have influence and control across the globe. Iran is a naturally stable power in that part of the world that has existed in some form or other for thousands of years but one over which the USA has currently no influence or control. The USA hates such a situation and will be hostile to any political entity that shows such independence.