system
Given the following post, respond as if you're commenting on Reddit:
human
[Mad Max] Aside from the first road warrior it appears all settlements are in the middle of nowhere. Barter town looks like a parking lot in the desert, why are there not more people living in pre fall towns or making use of pre fall infrastructure?

I would be curious as to what a large city looks like in mad max but I cant wrap my head around why its easier to build barter town instead of make use of Perth Stadium or some such,.
gpt
Mostly because in the days of the collapse and the late Resource Wars, the best success stories were the early adoptors. The people who bailed on the cities while the bailing was still good, and staked a claim out in the boonies. Immortan Joe is the best example of this; having seen the writing on the wall in his role in the Australian Army, he went AWOL before the collapse fully happened with a crew of people he trusted, and established what would become Gastown, the Bullet Farm, and the Citadel as their own private nation. 

Further, most of the cities would have gone down kicking and screaming in those early days, being reduced to warzones as the remaining populations who didn't F off while the Fing was good find themselves trapped with insufficient resources to escape or survive. Then, once that's all over but the crying, those that escaped are going to be looking back to the corpses of the old world cities as a target for salvage or pillage; anything that could be identified on an old-world map is a target. Between the stay-behinds who butchered each other over the last can of beans and the new-born tyrants ripping up the place, most of the cities are hellholes unworthy of occupation...

At least for a few years. As the epilog of Beyond Thunderdome demonstrates, once things cool off in the cities after a while people could make a decent run at re-colonizing them, and build a new life among the bones of the old world. Of course, by that time the players like Auntie have their own little realms which they would hesitate to abandon, leaving it to new players like Walker's kids to break that new ground.