That is true. But how many people actually care to do that? Sure you you can personally not litter but without the massive public awareness campaigns of decades past concerned individuals would never have been able to solve the problem of littering. The public at large needed to be on board. Ditto for "socioeconomic littering". While I'd really like to see some solution that doesn't involve regulation getting the upper classes to not spend their money improving their quality of life doesn't seem like a tractable approach. What's the point of having the money if you can't use it to better your life?