People that litter are atupid/lazy/poorly educated.

Littering is a function of the laziness of the individual combined with the inconvenience of normal waste disposal. If you live in a neighborhood where trash pick-up is infrequent or unreliable, you’re going to find a lot more littering as a matter of simple convenience compared to one where trash pickups are regular and routine.

The public expectation of efficient trash pickup also creates social pressure on individual neighbors not to dump illegally.