Amounts are very different. If you are hard up and need to take a #2 in the forest I don't think anyone will say you are evil for doing so. One poop in the forest vs you pooping your pants isn't a big deal. Now dump 40 gallons of black in a spot and just about everyone will think you are a D bag.
See the difference?
Tent campers might have a pan of water they use to clean up. They might pee in the woods or maybe do a #2. Regardless their foot print is very low.
As opposed to me pulling up and dumping 70 gallons of grey water or 40 gallons of black in one spot. Tent campers can do it though so what is the difference? A big one to anyone with half a brain.
Not too mention my grey stinks like all hell since we live full time, use the sink like its a home and I don't think anyone would want to smell it festering in the soil.