There are other ways to look at this 'litter' problem. Maybe for some people, it's a very easy way for them, and possibly fulfills a need as well, either as individuals or as part of a group, to 'dump their own personal anger, poor self-worth, envy, whatever negativity it may be etc' onto others.? We are all different so who knows what really motivates us to moan and groan about so many people who are deemed to have one major fault, they are not like me! People who litter for example could be seen as just another group to have a go at, single mothers, gay people, people who are the wrong colour, the wrong religion, the wrong nationality, the wrong sort of disability, the elderly, the lefties, the righties, the people in the middle,..blah...blah .......blah...........in reality, the list is endless! All of these 'bad' people, as individuals or groups might see and judge them, all there own 'negative fan clubs' who once their 'members' are 'poked and prodded' by a photo, a story or something else, they just want to GO for them! Newspapers do this very well, they take a side and it sells to the people that want to read such stuff.
All I'm saying is that no moaning will solve the problem in any way BUT it might be good for our individual poor self-image and whatever else makes us feel better about ourselves. All that I know is, I don't know the answer!