Quite the contrary. It doesn't matter what Iran does: their crime is existing without being under the control of the US. The US installed a puppet regime in Iran in 1953, and had a powerful vassal in the middle east, close to the Soviet Union. They freed themselves in 1979, gaining control of their own resources, and the US never forgave them for it. The only way the US would have allowed them to go on existing without attacking would be for them to become slaves again.