The first Mad Max movie is literally just a cop (Max) fighting against a deadly biker gang in a small town. The second movie didn't say anything about an apocalypse, it was just set in a desert wasteland.
It was the American (maybe international?) version of Mad Max 2 that added a prologue about an apocalyptic world event.
So yeah, in the original Australian version, this may just be some lawless hicks surviving in the Australian desert, while the rest of the world continues on like normal.
