I have had numerious doscussions with Park Service Employees. In their openion visitors to the park need to be limited to just a small handful at a time. Then those should be in a bus nor handled in such a manner they can leave no imprint what so ever on the park. Look at Denali Park. No one is allowed to drive into the park, you have to ride a bus, and the bus only stops at approved visitors centers. This way the visitors are controlled and then they are removed back to the Visitors center. anyone wanting to hike the park must apply for and be granted a permit. Then all kinds of restrictions are placed on you.
It's OK for the Bears to poop in the woods, and for the Wolves to poop in the woods. But if you are a visitor hiking in the Park, you may not poop in the woods. If you do you have to place it in a plastic bag and remove it from the park as you leave.