I and a friend were driving through an area of North Dakota some years back coming back from a hunting trip when we found ourselves in the middle of trash all over the highway, junk thrown in the ditches, wind blown garbage everywhere, and then we drove by a dumping area totally overfilled with all kinds of trash. It woke me up. Nobody on the reservation cared about how they were treating “mother earth”.
You are seeing the symptom of a larger illness. You would possible understand the malaise if you spoke at any length with members of the tribe. A people without hope and hungary, and suffering from terrible depridations are not too worried about trash that is not picked up due to lack of services we take for granted.