Back before the Pave the Earth mentality took hold much of America was considered a pristine wilderness. Strange as it sounds today, the majority seemed to think that a GOOD thing. From a "pack in, pack out" perspective bathrooms make sense to me; there will still be an environmental impact, but I expect it will be less than just letting all of the millions of visitors most national parks get annually just dump wherever they please (and how much do you want to bet the Interior Dept. could put a precise number on the figures? ) Animals leave corpses in the woods, too, but we probably shouldn't.