My question is, why? What does it matter whether the virus originated from a lab or from a wet market - it isn't any more dangerous if it came from a lab, nor does knowing the origin really help dealing with this crisis at all.
It is certainly interesting to know where it did originate, and that knowledge could inform a debate on the future of (respectively) wet markets and animal husbandry practices, or BSL facilities, but these don't strike me as particularly emotionally charged topics, and in any case the posts I'm referring to don't mention these debates...
Anybody care to explain why you would respond so strongly to claims of lab origin?
Internally they are heavily pushing the preposterous claim that the virus is of foreign origin, possibly imported via frozen food.
Objectively lab origin seems likely. The virus started in the city housing the only P4 laboratory in China. This laboratory is known for its lax security (see the 2018 American embassy cables and the declarations of multiple sources in France who participated in its construction) and research on bat coronavirus transmission to humans were conducted there. You don't have to be a conspiracy theorist to wonder if an accident didn't happen especially considering that we still can't find the missing link which would firmly establish a zoonotic origin.
Of course, as China is extremely uncooperative on this question, we will probably never know.