Not to mention that at no point is anything about the society depicted as being somewhere actually good to live. The movie ends with defectors from decadence killing the god-king and presumably overturning the order he built, and it's framed positively
It started like that, but then there was a nuclear war. That's why there was the Atomic Cafe in Bartertown. It was a reference to a documentary about nuclear war information films of the 1950s.