Just another rewording of:
In (rich, homogenous country X) they managed to organize (nice, progressive social program Y) and had good success. I wonder how they do it ?
It's easy to pay for your neighbor to have free health care when his name is also Lars Larson. It's easy to fund public initiatives when the end users are also named Asahi Ito, just like you.
For example Australia is just as multicultural as the US, has a good public health system, and public toilets are clean and ubiquitous. Maybe not quite as clean as Japanese toilets, but far cleaner than what you'd find in San Francisco.
IMO disrespect to public spaces arises from apathy (India/China are good examples), social tensions and abstractions (government taxes/responsibility).
While I don't think racial homogeneity is apart of it, cultural compatibility absolutely is. It's mostly co-incidence that differing racial groups carry differing culture baggage. As any race can adopt kinder cultural values and principals.