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?
Someone mentioned in another comment that some on the left were tying criticism of China with racism, and I'd like to point out that those identity politics only benefit the right. I think this link is mostly coming from some of the US liberal class (financially well off, lives aren't directly affected by election outcomes, centrists, etc.) and not from The Left (socialists, left of Bernie types).
Blame a government, not its people. There is plenty of criticism to throw at China without being racist. But if anyone is claiming that blaming China is racist then they are just as misdirected as the people that use criticism of a county to be racist against its people.