I agree with you, but I don't see Occam's Razor applying here. There really is no more likely point of origin with just a cursory look at the situation. There's a bio testing lab at the point of origin, but there are also numerous examples of viruses jumping species.

Looking at the behavior of the virus and the arguments of some evolutionary geneticists (and I'm not well versed in genetics so I'm trusting their credentials here) changes things a bit of course.

My logic for Occam's Razor is that if you see someone dead on the floor it's most likely they died of a heart attack. If you see someone dead on the floor and they are next to an open bottle of poison, they most likely died of a heart attack.

Now maybe statistically it's more likely that someone just happened to have a heart attack next to an open bottle of poison, but Occam's Razor isn't to select the most likely answer, it's to select the simplest answer. The simpler answer is that he ingested poison, rather than he had a heart attack near a bottle of open poison.

If a pandemic involving a bat-virus swapping species starts in a city then it was probably just a virus jumping species. If that city happens to be doing active research on how much bat-viruses can swap species, then I think Occam's Razor can apply.

Obviously there is no objective truth to Occam's Razor, and what I think is the simplest explanation may differ from what you think is the simplest explanation.

I understand where you’re coming from. However couldn’t the even simpler explanation be that viruses frequently travel from bats to other species, this lab is in this city because there are a lot of bats with viruses there, and the thing that they are there to study ended up happening?

I agree that’s a high possibility totally, I just don’t see how we can exclude the other possibility as confidently as everyone else seems to.

Also, I think doing active research on something that can jump species and is highly contagious in a city would massively increase your risk of it jumping species in that city. That risk is increased if the lab is known for poor controls and was flagged as a risk, as the one in Wuhan was in the us cables.

Additionally if a researcher did get infected, there is a high chance that they would be asymptomatic and wouldn’t even know it was them.

The only “proof” that it wasn’t from the lab is the dna analysis, but that only proves that the research wasn’t altering the genome / that there was bio-engineering, there is still loads of research you can do without playing with the genome.