>>2573814its to prevent the "day campers" and "truck glam campers" from shitting all over the place, leaving trash everywhere, throwing all their beer cans and beer bottles into the firepit and leaving the campsites and areas a danger to other campers, wildlife, and making places inhospitable to other humans to visit, let alone wildlife
Imagine if Yellowstone National Parks Tourists just constantly dug holes, shat everywhere, around/under/on top of everything, within a day or two no one could walk because the trails would be full of human excrement, the environment would be destroyed by everyone making trails everywhere to avoid the shit and of course shitting on said newly made trails.
Bears, Cougars, Wolves, and more would be constantly digging around for food/beer/corn/drugs in that human shit and now you can't even look around Yellowstone, because its a festering pile of shit.
Leave no trace also applies to deserts(closest to California/Texas) because that shit will be there long after your corpse gets cremated and rock tumbled into powder. Also all the horrible shit we eat and leave in our shits nowadays. Remember all that asbestos, heroin, literal radioactive plutonium/cobalt and other shit being peddled as HEALTHY SUPPER FOODS/CURE ALLS?!?!? Now that its in shit form, someone will inevitable slip and fall into it either the day of your shit or 100 yrs later, and oops, now everyone has Covid because you shat the virus into a well preserved patty.