[totalZero]

I agree with your desire to draw conclusions only on an evidentiary basis, but technically there is a logical flaw in your way of thinking:

If I isolate a virus from a bat in a laboratory, and then that virus escapes my laboratory (could be due to poor disposal of specimens, inadequate disinfection procedures for employees, etc -- not necessarily intentional), it would be both true that the virus came from bats and that the virus came from my laboratory.

I'm not saying that the virus came from the Wuhan lab. I'm just saying that "it clearly came from bats" does not preclude the possibility that the virus was stored in (or spread from) a particular laboratory.