[jerf]

This is like the opposite of the Tragedy of the Commons. If everyone in your neighborhood pitches in and picks up trash, it will be clean. If nobody does, it will inevitably decay. Doesn't even have to be littering; things blow in, accidents happen, trash blows away, stuff happens.

The residents of your neighborhood will collectively decide what kind of neighborhood they live in by the actions they take. Whether you find this morally offensive, morally harmonious, or some complicated other combination doesn't affect the brute fact of the matter.