There is also an important category of people who litter if and only if they see other people doing it, regardless of convenience. How big this category actually is, I don’t know. They would not litter out of malice, but simply because they see other people doing it, therefore it is no big deal.
Even without seeing people littering—throwing some trash onto an already littered street would be seen as less of a big deal than throwing the same onto a previously very clean street, I’d guess.
Even without seeing people littering—throwing some trash onto an already littered street would be seen as less of a big deal than throwing the same onto a previously very clean street, I’d guess.