I agree. It was American involvement in installing and supporting Reza Shah that was probably the main factor in his undoing. The mullahs had been quite unsuccessful in their opposition to him at least from the early 60s. It was the socialist students, the Tudeh party backed by the Soviet Union, that got the traction that led to the revolution (which the mullahs then hijacked).
The only way America can become involved is if we are invited in -- much as we once asked for help from the French. This has to be their revolution.