The rationale for the illustrated procedure is explained at Neatorama and the embedded links there. Many years ago I found a side-trail at the arboretum at the University of Wisconsin-Madison where animal carcasses had been secured to the ground under wire mesh (to discourage carrion consumption by larger carnivores), so that students could monitor the breakdown of a turtle, rabbit, bird, and various other mammals. Sadly, the site has not been refreshed with new dead critters.
I wonder if a similar procedure could be followed at a national park. Haul the deer carcass away from the trail, put up an instructional sign, and let visitors (if they choose) see what happens in the natural world.