No one, to my recollection, ever said the OP should not be allowed to camp on his property, or that a camper constitutes a mess.
Then the discussion wandered off to the whys and wherefores of such regulations, and whether they are "just" or not. Even Thomas Jefferson weighed-in with an opinion, although it must be noted that T. Jefferson seldom practiced what he preached.
Of course the Native people were trashy, you can still find their middens.
However, they did not manufacture mountains of goods that required disposal, or rely heavily on man-made materials and chemicals, suck oil and gas out of the ground, extract minerals by the train load, and there weren't 313 million of them occupying the same amount of space. There were an estimated 2.1 to 18 million (I don't think anyone knows how many for sure) Native Americans when Columbus reached the Americas.