I actually just finished a college paper for my English class on this problem! I really had fun with it because I can relate so well. I ovbviously ride out there, but also like shoot out there, respectfully of course. I use the designated area, pick up trash, and use common sense. Anyways, because of funding issues, I think the area may soon be closed to shooters entirely because of those few "stupid" people. Tis' sad, but just last month in Carolina, there was actually a case of a stray bullet killing a horse in someones pasture because a man wasn't using an area with a backstop.
"Horses don’t have hard mouths, they have hard, stiff bodies. The softer you can get the horse through his body, the softer he will be in your hands." Clinton Anderson