I pick up litter a lot. While fishing the local rivers, while walking my dogs in the park, while at my customer's properties (apartment buildings). My theory is people sometimes feel they have little control over their lives and doing stupid stuff like littering makes them feel empowered. The mentality is "you're not the boss of me", they know they're not supposed to do it. Doing it makes them feel in charge. Truth is they are taking the power they have and blowing it