That's a very good question.
By the way, the strains of the virus that have ravaged USA until recently being starting to be overtaken by the Delta variant came from Europe and the UK. The strain of the virus in Wuhan, China possibly never came to USA or died out shortly after arrival and yet the western media will simply ignore all this bare evidence and choose to just blatantly point the fingers at China.
I have been saying this for quite some time now.
I am not an expert, but from common sense...
1. Through research, it is already known that the Covid outbreak in the US was caused by travelers from Europe
2. If China was the primary source of the virus, then it would follow that the overseas Chinese communities would be the hardest and first hit. Again, we have no such evidence...
Comparatively speaking, Delta has definitely spread widely amongst the overseas Indian diaspora...
3. If Wuhan was the definitive outbreak source, then we would have seen outbreaks all over China as many people travelled from there. However, we see that the lockdown was able to stop it in its tracks. Extrapolating from this, other Asian countries were also able to control the spread early on.
I saw a YouTube video that theorized Chinese workers had spread covid throughout Europe (which is why there might have been covid detected in those sewage samples), but again, doesn't really make sense as to why more overseas Chinese people wouldn't be harder hit.
If we were to assume Wuhan was the source of the outbreak, then wouldn't it be kind of elementary to compare the amount of travelers from Wuhan to elsewhere in China vs. Europe in December-January to give a general probability of how likely the virus spread from Wuhan to other places? If the volume of travel from Wuhan to elsewhere in China is 10X more than travel from Wuhan to Europe, doesn't it make the idea of some random single "Patient zero" asymptomatically spreading covid throughout Europe (starting with Italy) highly, highly unlikely to the point of science fiction? The timing of the Wuhan outbreak relative to the major outbreak in Italy follows the general incubation period (2 to 3 weeks). However, there is still somewhat of a missing link here, because it still does not explain why there were only a few dozen detected cases elsewhere in major cities in China.
The lab leak logic is similar, because WIV is close to the first outbreak, then a lab leak is a simple conclusion. However, that conclusion would be ignoring all of the obvious evidence above.
The desire to pin the blame on Chinese government inaction is very hard for the authorities to swallow. The SARS epidemic was an extremely tough lesson to learn from. It was because of SARS that the Chinese government developed cooperation with the US CDC. The ability to curb the Covid outbreak in China should have shown the world that the government learned its lesson from SARS, but instead the western media and US politicians still want to play the blame game.