Having hunted and done some target shooting on BLM land out west in the past, I can agree that some recreational shooters need to clean up after themselves.
That being said, I see the same types of shooters at the public range too.
Police up your brass and carry what you brought with you back out applies anywhere outdoors.
NRA Chief Range Safety Officer, Home Firearm Safety and Basic Pistol Instructor
"There are three classes of people: those who see, those who see when they are shown, those who do not see."
Leonardo da Vinci