A lot of it is cultural. In a lot of Europe and in Japan, the cultural expectation is that you just don’t litter. The average Japanese would not even think of throwing something out a car window because it would be shameful and shocking. And the government doesn’t have to outlaw it. I love America bad our individual freedoms. But a good sense of manners, thoughtfulness, and politeness would do us a lot of good as a culture. And it should come from us the people, not from the government down. But if we don’t self regulate, we shouldn’t be shocked if someday it isn’t dictated to us. Irresponsible use of freedom eventually breaks itself.