You must realize that in most of the world, shopping at a clean and modern supermarket is an expensive luxury that the average person can't afford. A "wet market" is not just some kind of exotic bazaar that depraved nutjobs go to buy weird shit, it's literally how most people in the world buy their food, so shutting them all down isn't really an option. Now obviously the trade in wild animals is inherently problematic and should be stopped, but those laws are difficult to enforce because there is so much money to be made smuggling them, perhaps a sign that the Chinese government doesn't have the absolute control over society that everyone thinks it does. And it's not really a matter of hygiene either, slaughterhouses even in developed countries are horrifically unhygenic but that doesn't really matter because humans have developed immunities to most of the diseases that can be carried by domesticated farm animals, but for wild animals there is always that risk of these novel viruses spreading. But it's not really a matter of culture, since it's only a tiny fraction of rich assholes that partake in this stuff, so seeing people immediately jump onto the yellow peril nonsense obviously raised red flags.