East Asian national parks are also completely paved over and devoid of almost any remnant of a natural experience. And please don't tell me it's only westerners breaking all of the rules in US national parks.
EDIT: It's also certainly not just westerners, but again, my experience has shown me that there are societies that do better at training citizens not to litter.
They could have just as well been more specific and simply said 'China' or name the specific parks rather than to write 'east Asia'.