I wouldn't call that evidence. "He's shot a gun before" isn't evidence, and coronaviruses are a pretty broad group as I understand it (not an expert).
This is a densely-populated, agriculture-heavy third-world part of the world that had bird flu and sars in the previous 15 years... random-ass diseases materialize there. Occam's razor says it's another one of those.
I don't think you're being very good faith right now.
Clearly a lab studying coronaviruses is interesting. Clearly its possible that the lab could have had a leak. Clearly it's possible a farmer could have wandered into a cave, or run into a bat in the wild. Clearly it's possible that it didn't originate in China.
There is certainly enough evidence to investigate the lab being a possibility. It definitively being responsible or not is definitely of interest. There was a lot of cover up at the beginning, which implies to me a party who knows they are responsible.
From everything I've read on the topic, the best going theory that I understood is that in order for the lab to perform tests on coronavirus found in bats, coronavirus samples are collected from bats. A person must collect these bats from caves, not in Wuhan. A person might have collected the samples improperly or with insufficient gear, resulting in contracting and then spreading the disease.
That's not a "controversial" (read: conspiracy) theory, that's not an act of the state being evil. That's something that could happen anywhere in the world. That's something that could happen on accident. That's something that could be prevented by improved process/standards/equipment. By denying the possibilities of such things, it makes it look like there was a coverup or an explicitly guilty party. Everyone should want to know the nature of it's origin. It should obviously be a possibility.
> Occam's razor says it's another one of those.
To me occam's razor says that Wuhan is a first apparent epicenter. So it stands to believe it's the first place with major outbreak. Wuhan has a lab that studies this very disease specifically for it's epidemic properties. The most simple occam's razor explanation to me is that it has to do with the lab.
2) Direct bat->human transmission (your example fits here as a tiny subset, I don't think specifically employees of that one lab are the only people who could have had contact with a bat)
3) Lab leak
I'm rating the probabilities as I see them. Your scenario is possible! It's just not the most probable, and even if it were, there are a lot of possibilities.
This is a densely-populated, agriculture-heavy third-world part of the world that had bird flu and sars in the previous 15 years... random-ass diseases materialize there. Occam's razor says it's another one of those.