The extent of urban decay is probably higher in HK than in any Western city on per capita terms, not by sheer numbers. It all happens deep inside decrepit buildings, in basements, and on rooftops. That's the difference - in for example South Bronx it's all right in the open. In Hong Kong, it's hidden from street view, which in a twisted way makes it a great place to live for us with more money than we know what to do with. It's the easiest city in the world to be ignorant.