Saw a video from Denmark I think where everyone is biking everywhere and the metro station has an enormous numbered rack for depositing bicycles for storage. The entire thing is spotless, well maintained, and has zero graffiti.
All I could think is that in the US the fabric of our society and the integrity of the social contract is so degraded that even if we somehow had the political capital to build it - it would be destroyed by individual anti-social behaviors. And we'd certainly never have the wherewithal to maintain or repair it.
I think the problem would be not considering the upkeep. Just look at the roads in the US, individual anti-social behavior didnt graffiti those potholes.
Probably helps that kids are instilled with a sense of cleanliness at a very young age. Kids help cook school lunches on a rotating schedule, and everyone helps clean up afterwards. Litter is also a big social taboo (which is funny because public trash cans are basically nonexistent. You’re expected to carry your trash with you until you get home.)