The Chinese do shoddy work and should not be working with highly infectious diseases.
The Chinese are the kings of crappy low-quality goods and merchandise. They are taking huge risks working with highly infectious and transmissible viruses like the coronavirus, and other biological agents and chemical agents including those agents used in warfare.
Perhaps the Wuhan virus escaped from the laboratory, above, in Wuhan, that is a bio lab, where they work with bats and bat viruses. Perhaps a Chinese employee of that laboratory decided to make a little extra money by, instead of incinerating infected bats that they were workign on in the lab, took those bats down to the "wet market" to sell, thereby causing the whole novel coronavirus wuhan virus. It's sound plausable to us. That is exactly how something like this could have happened. Of course this whole thing might also have been a test of a new way to start a war - to use one's own people to transmit a highly infectious deadly disease to foreign shores, destroying the enemy's population, economy, and readiness to fight and defend itself?