Are you an idiot, or do you just play one on the internet?
Various cultures have been "ranching" in aired regions for thousands of years. What has changed is government regulations.
If people and livestock needed water, just dig a well. In a lot of states people are not allowed to dig a well or even catch rain water. Government controls the water. As such, people and livestock are suffering.
Then there is this whole building cities in aired regions issue.
But then again it is not just aired regions that are having issues. Cities from California to Georgia are facing water problems. A few years ago Houston issued a water rationing order. Its not like Houston is an aired region.
The truth is, population density and growth of urban regions is outpacing water supplies.
If you will excuse me, I am just going to go pump some water from a stream on my property to water my garden. Unlike states like California, Texans own the water on and under our property.