Until you found proof for a hypothesis to be correct. At witch point you usually stop trying to falsify that hypothesis. Applying that to the Wuhan lab theory, the correct way would be to properly falsify the natural jump from animals to humans first. Scientifically falsifying it. I have yet to see such proof.

EDIT: Of course these proofs have a certain likelihood of being false, hence all the p-value chasing and confidence-level adjusting.