“And if you ask me why the Chinese had so much more incidence of the disease than Japan did, I will tell you...
I don’t know.”
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My understanding, based on an extensive and detailed article from someone who was there, is that they are (as a society) pigs.. up to and including having their infant kids crapping and peeing in the streets. That would make their society pretty much the polar opposite of the Japanese in this regard (and would also at least partially explain Japanese contempt for China during WW2).
I believe you are 100% correct.
It started in China.
That is why.