- If there was any hard evidence actually proving they had SARS-CoV-2 in the lab before the pandemic, it will be long gone. Only an independent full access forensic level investigation would ever find any sign that evidence was destroyed, and that is never going to happen.
- It seems extremely unlikely to me that anyone from within China will A) blow the whistle or B) that we would hear about it.
- If a whistleblower were to escape the country, China would be able to claim they are lying, and it is a plot by the West to oppress the Chinese people etc. The chance that the whistleblower would be carrying irrefutable evidence of a lab leak is again almost zero.
We can keep shaking the tree, but I don't think anything truly satisfying is going to fall out. Consider that even if the USA for example had actual evidence of a lab leak, they would be better off using this as leverage over China secretly than releasing it publicly.
What actually can and should happen, is that some major change comes to virology research to absolutely minimise the chance of another lab origin pandemic. Wherever SARS-CoV-2 came from, we have had lab leaks before and we will have them again, that much is certain.
Not to mention fixing all of the other failures that allowed COVID to kill millions worldwide. Everyone's pointing fingers but hardly anybody's talking about improving epidemiology and public health policy (which the US is long overdue for a reckoning on).
One of those failures, by the way, was the seeming assumption that whatever state a global health emergency started in would act in something resembling good faith. Regardless of how COVID came to be, China wasted precious time deflecting when it should have been diligently helping to sound the alarm and properly investigate.
And how many other countries might have prevaricated in the same fashion, if the pandemic had started within their borders? This is not a failure concerning China specifically. Indeed, there will come a point where blaming China for COVID, however cathartic that might be, will be counterproductive to preventing future catastrophes.