With the high level of foot traffic in certain parks, packing it out is the only responsible way to deal with it.

https://www.nps.gov/articles/000/idkt_lnt_3.htm

my mom handed me a shovel before heading out on a cross continent road trip,lived in vans and busses for years, back roads mostly, best camp spots are not on any map what so ever....hay roads, or just some ruts leading off then lived way back away from the road in a few different spots

I have noticed that many "popular" sites are truely disgusting and rarely go to them, and stick to the path, or bushwack cross country well away from the main route