The Shah was an evil bastard. The US really should have had no business making allies with evil dictatorships just because we were scared of socialist takeovers.
Uh, that was the entire foreign policy of the US from 1950 onwards. Your suggestion of US staying out would have caused the unemployment of thousands of sleazy CIA agents whose only job was to force out legitimate democratically elected leaders in these middle eastern and banana republic countries, and install diktators like the Shah, install corript leaders like tha Saudi regime and their Bin Laden cohorts, and Cuba, The Contra crap That Senile POS y'all had for a president
WHat can out of work CIA agents like that possibly do for a job otherwise? Perhaps the mob can take them in?