I'm not really seeing the link between (I presume racial) homogeneity and clean toilets - there are plenty of developed countries with multicultural societies and progressive social programs.

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.

Hah not where I live. You must live in a fancy part of Australia. I saw more cleaner toilets in the backwaters of China than here. At least when I did see them haha

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.

My first instinct was to agree with you. Sadly, I know quite a few Americans who could care less about their homogeneous neighbors, let alone those of different colors/creeds/cultures.