[GrinningFool]

> Surely, the question must rather be whether > it is morally acceptable for us to impose such > a rule on other people.

When people are not considering the effects of their actions and possible harm done by them - litter, environmental - because it doesn't benefit them to do so, then it's the elected government's duty to step in and impose such rules. People have already made clear through their actions that in the absence of those rules, they won't behave on the best interests of the community.