You never said anything about Cambodia, you talked about the situation in Rhodesia.
The situation in Rhodesia isn't really comparable to Iran.
If people are getting cut up with machetes on a regular basis, then that's comparable and I'd say it's worse and worthy of our interjection. Ultimately the world revolves around money though, so we won't do anything for either.
"George Bush says he speaks to god every day, and christians love him for it. If George Bush said he spoke to god through his hair dryer, they would think he was mad. I fail to see how the addition of a hair dryer makes it any more absurd."