The 1953 actions were in line with the containment strategy against the Warsaw Pact. Iran had a border with the USSR and ceding that strategic a location to the communists was not going to happen. If we had not installed the Pahlevi's Iran would have been a Russian satrapy until the fall of the Berlin Wall in 1989 at the earliest. As bad as the Shah was, when it comes to dictatorship, he has nothing on the Mullahs of today or whatever Persian Ceauşescu the Soviets would have installed.
As for the actions of the 1980s, what did you expect from the US after the Islamist faction of the Iranian revolution invaded the sovereign soil of the US?
This commenter is wrong about US enmity towards other nations. The US doesn't hate other nations; not even France when they deserve it. We get angry, but abiding hatred is just not part of our national culture. We aren't old or failed enough to waste our energies in pointless hate.