I don't think the WMD thing was anyone being wrong; rather it was a deliberate lie to justify a war that was wanted for other reasons.

But agreed in general; I think there's a lot of political opposition on the left to the lab-leak theory, in no small part because Trump pushed so hard to blame the Chinese for the virus while in office. Even if unlikely, a lab leak is far from impossible as a cause, and we should talk about it and explore it until evidence conclusively rules it out.