Felines and mankind have been residing in harmony for many years but that hasn't always been the truth. There have been times when felines have been almost destroyed in the name of God. And what took place the Black Death reigned supreme for a lot longer than it will. So we will get back to the beginnings of recorded background to the time of the pharaohs of Egypt. Here cats were revered as Gods and many were mummified to previous for eternity. Because the cats guarded the grain warehouses and wiped out the rats and mice that given on the grain. Therefore lowering famines, that were the curse of Egypt. It had been illegal to wipe out cats in those days, like cows in India today.
I believe one of the reason why there were not many cats around is basically because they used to eat them. And once in a while the restaurant kitty catches would grab an pet cat they may find and take them back to the restaurant. I remember seeing felines in glass shows out leading of the restaurants. But somewhere between then and now they restricted eating cats. So cats are now not on the menu and now there are cats everywhere. Many of them started off in someone's house and acquired thrown away, because so many are incredibly friendly. Also they have this thing about abdominal worms. And in those days China had not been as modern as now so belly worms would have been a problem. Fleas are not really a problem because they may have tile floors and solid wood furniture.