Your entire premise of pointing to Iran is based on what Louis Freeh has said, while in fact it was proven that the Saudis attempted to steer the CIA, FBI and the U.S. Gov. investigation away from Osama Bin Laden and the Saudi regime.

http://www.counterpunch.org/porter06242009.html

".....a systematic effort by the Saudis to obstruct any U.S. investigation of the bombing and to deceive the United States about who was responsible for the bombing.

The Saudi regime steered the FBI investigation toward Iran and its Saudi Shi’a allies with the apparent intention of keeping U.S. officials away from a trail of evidence that would have led to Osama bin Laden and a complex set of ties between the regime and the Saudi terrorist organiser."

(*This is the first of a five-part series, "Khobar Towers Investigated: How a Saudi Deception Protected Osama bin Laden". The series was supported by the Fund for Investigative Journalism.)

Gareth Porter is an investigative historian and journalist with Inter-Press Service specialising in U.S. national security policy.

continuation of my earlier comment.
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You speak about the U.S. having a grudge, I wonder what you think the Iranians feel about us: (1) toppling a democratic leader and installing a puppet dictator; (2) supporting Saddam during the 8 year war against Iran by providing military arsenal, satellite images of the Iranian infrastructures, including their oil refineries( bombed and destroyed), as well as chemical and biological weapons which killed over 1 million Iranians; (3) violating the Algiers Accord which required the US to end interference in Iranian affairs and return all the Iranian assets held in the U.S.; (4) imposing 30 years of illegal sanctions simply because we don’t like the regime and (5) using the nuclear issue as a political hype to deny Iran its inalienable right.

The bottom line is that neither the U.S. nor our ally Israel can stand any country which is an obstacle to our hegemonic ambitions in the Middle East and can be a counter balance to Israel in the region. You speak about agreements and treaties – We have absolutely no respect for any treaty or international agreements if they don’t serve our interest or the interest of Israel.

An absurd comment. .

Neither the Iranian Gov. nor its people are a threat to the U.S., Israel or any country for that matter. It is a joke to consider Iran a threat against the more powerful military in the world, and Israel which has an estimated 200 to 500 nuclear weapons, a non-signatory to the NPT. Furthermore there is absolutely no evidence that Iran is developing nuclear weapons. All of this crap about spreading its revolution and values are attempts to demonize Iran to create fear.

America holds a grudge against Iran but not for the reasons you have cited.
The U.S. holds a grudge because the 1979 Revolution finally brought an end to U.S. grip on Iran when our “guy” the Shah was booted out and we lost our foothold in Iran.

Our values is another joke. We were the country who toppled the democratically elected leader of Iran in 1953 via Operation Ajax and installed a brutal dictator who ruled Iran with an iron fist. We love dictators and we are more than happy to install them, support them and provide them with the most sophisticated military arsenal so long as they are our puppet, regardless of what they do to their own people.