I think it's fair to say that there is way more disrespect for others here (in the US) compared to some other places around the world, and I think it's the individualistic mindset we have, so I'd say it is largely cultural. But some places also have really intricate garbage disposal systems so, that's the other part.

This issue in particular I actually posted about on /r/asknyc a few months ago when I saw someone tossing napkins out of their car. I was met mostly with agreement that it sucks, but there were a few that told me to mind my business or suck it up or whatever. It sucks. People suck.