there is no evidence it came from a lab, just supposition. The reality is the scientists don't know with any certainty what the source was and I'm damned sure none of us on here do either.
The wet market theory is based on circumstantial and historical knowledge of how sars viruses started. It probably has slightly more credence than other theories but is far from proven.
Right let's drop some facts that we do know:-
1) Fauci through Ecohealth was funding gain of function research in that specific lab, researching specifically coronavirus' and specifically increasing human to human transmission.
This is not suggesting it was released deliberately but it is very important because as the major proponent of gain of function research it gives him a real conflict of interest.
2) The gain of function research was being done under BSL2 conditions, this means it was the equivalent safety and security of you or I going to the dentist. Furthermore the people doing research had not been vaccinated for the diseases they were researching.
3) With Sars and Mers they were able to trace the lineage back to animal to human transmission.
4) they have not managed to find a single link between for human and animal transmission with Sars-2 despite testing 80,000 different species.
5) A furin cleavage site is in the virus which is not possessed by any other known coronavirus. Suggests manipulation during gain of function research.
6) The WHO weren't allowed access to the lab for over 12 months.
7) Cases had been found months before the wet market without any links to the wet market.
Now like you've said all of this is 'circumstantial' but how do you expect to prove it Marty? What evidence is there for ANY transmission from nature?