[opportune]

I highly doubt the causation goes in this direction. I think it's just a matter of culture. People in the US litter way more than people do in Japan, for example. I agree with the other poster that it's really just a small minority, maybe even less than 1%, of Americans that just ruin public facilities for everyone. But this minority does exist.

You could argue that we are just using coded language for homeless people, which often is more of a combination of mental illness or substance abuse problems and abject poverty. But I think there are plenty of people that ruin public services aside from the homeless. Even as a lifeguard of private pools, I've had to deal with large amounts of litter, abandoned trash, and feces/urine on regular bases.

[autokad]

there are just a lot of people who things the world owes them something and they have no respect for their surroundings / community.

I was waiting for the subway, and this guy leaning against a trash can throws his trash on the ground. If I didnt see things like this nearly every day I would write it off as a one time occurrence.

[escapetech]

Certainly while there are cultural aspects at play, it's impossible to ignore the reality of certain areas in America being cleaner and less littered, and better serviced than other areas, and a large part of that has to do with the money available for people who inhabit and regularly use those spaces/facilities, and the ability to keep away certain demographics in order for the money to continue to be available.