If you want a happier example, there’s the trash in Wisconsin state parks. The Dept. of Natural Resources used to place trash receptacles in our state parks, and haul the trash away. That worked, people put their trash in the bins, because that’s the social expectation.

But the DNR lacked the staff to keep up with the trash. Sometimes animals would get in and spread trash around, but mostly, people would pile trash on or around cans and dumpsters. If that’s where you put your trash, that’s where you put your trash, right?

So, the DNR simply stopped putting trash receptacles in the parks altogether, and announced that you’d have to pack your own trash out. And it worked! Without a socially-sanctioned place to deposit trash in the park, people pack it out. (Mostly. Humans are still essentially animals, so various detritus gets dropped, but no garbage bags full of food scraps left on the ground for the raccoons.)