IMO, it seems obvious from the behavior of China's government that they know it is a lab leak. If it wasn't a lab leak, then presumably there is an animal reservoir of the virus somewhere in China, but as far as I know they haven't claimed to have found it. But if there is an animal reservoir of the virus in China, then how could the Chinese government ever expect a lockdown to work? A lockdown on travel would only r…
Lockdowns serve a purpose: to slow the spread of the virus.
If you can’t understand that slowing the spread (exponential growth factor) in a pandemic is priority number 1, and can’t understand that lockdowns serve that purpose then take up knitting or pottery or something and stop commenting on pandemics.
China is a highly population dense country with incredible means of public transit, and millions of people moving back and forth every day: these factors all serve to increase the exponential spread of the virus. Slowing the rate of infection helps reduce hospital and equipment overload, gives more time to develop a vaccine, and increases each individual’s chances of survival when they do become ill.
^ If you can’t understand the above then pottery and knitting.