system
Given the following post, respond as if you're commenting on Reddit:
human
[Mad Max: Fury Road] What is the world like outside of Immortan Joe's sphere of influence?

Gas Town and the Bullet Farm are about as militarised as Joe's lunatic death cult, so clearly they need that firepower against someone. The Rock Riders have no clear means of surviving other than robbery, and the Buzzards are clearly regular raiders themselves. The Vuvalini/Many Mothers are also used to ambushing travellers.

Joe's citadel is the only place we see actually grow food, but who are all these other people brutalising? Clearly there must be a fair amount of prey to support this many predators.
gpt
It's generally believed that the land is divided up into zones where different warlords take control of the area *or* different survivors attempt to eke out a living among the wastes.

From the closest that we see of the world to the Fury Road movie, the video game developed by Avalanche, there are a variety of settlers around the area which is only tangibly related to Immortan Joe's operations (you still explore Gas Town and the enemies are War Boys, however).

We see people attempting to settle a disused oil refinery in Mad Max 2 and there are two warring warlords who are trying to keep order in another town in the third one.