It does seem to follow a sense of involvement in community.
In wealthier and more educated areas, there is less litter. In fact, a stray can will be removed from the street quickly in a more affluent area. In poorer and less educated communities, litter is rife. A stray can will rust and decay before anyone lifts it from the ground.
Maybe if normal people could adopt patches of areas instead of big corporations? If somehow average people could feel an attachment and investment in their own little space? I bet there would be a host of creative and beautiful settings if we could somehow get everyone to see Nature as part of a whole. After all, birds and trees and grass don't care how much someone makes......