If you want to understand the iranian point of view of US-Americans you must look at their history.
Iran exists since 2500 years. It is an aryan nation surrounded by semitic arabs or other races and cultures.
In the last 100 years it simply wanted to be neutral but this wish was ignored.
In WW1 - although Iran declared its neutrality - the Russian Empire, the Ottoman Turks and the United Kingdom ignored this neutrality and used north-Iran for their WW1-battles.
In WW2 - although Iran declared again its neutrality - it came worse: Invasion forces from the USSR and the UK occupied the country in order to abuse it as a transport route for allies supplies for the soviets. The Shah was deposed and his son installed as a puppet.
After WW2 Iran became a US-satellite. But the relation ship to the USA was first a true friendship. Because the USA had none of the bad history dealing with Iran like Russia or the Uk had.
But then the incident happened which finally led to the bad relationship and mistrust of today:
In the 50ties a democratic leader of Iran, Dr. Mossadegh, deposed the Shah in an unbloody revolution and sent him to exile to Italy. He ewanted to transform Iran into a democratic country.
But then the CIA intervened and arranged the deposal of the democratic Mossadegh and the reinstallation of the dictator called Shah Reza II.
And to make it worse they helped the Shah (who now feared a new rebellion) to build a Gestapo-like secret police with the name SAVAK.
Tenthousands of Iranians just disappeared in the following years and the iranians blamed the USA for this development.
And although the Shah and his terrorism against his people increased their actions from year to year he couldnt prevent the revolution when all the hate broke out.
The rest is history.
Iran has changed in the last years and was starting a democratic reform process. But after the stupid "Axis of Evil" speach of Bush jr. the fear (and combined with the fear) the mistrust is growing again.
