Some people are just too lazy when it comes to throwing garbage properly. They take aim and make an attempt to throw the bag of garbage into the garbage trolley while sitting in their cars. They miss. They just drive away. Possibly it is against their dignity to get off and throw the garbage properly. But these small acts are really learnt at home from childhood. The rest of the job of spreading garbage all over the streets is done by other cars that run over the bags lying around the streets and also by cats that look for easy meals.