Same as everywhere else: be sure of your target and what is beyond it.
I primarily shoot on public lands in AZ, but not where everyone shoots Willy-nilly in any direction. I find places by myself or with small groups and we shoot at targets backed by berms. We do not shoot trash, and often spend more time cleaning up after smugglers and lazy recreational users than we do shooting.
I have never been to the area described in the article, but have been to a similar location in another state. Didn't take long to cure me of that.