In 2001 the US defence department changed and put it's entire research budget through Tony Fauci's NIH. Since then it's been doing secretive bio defence work.
When covid broke out the scientists got together to write a paper about it and privately thought they couldn't see how it happened naturally and it was "so frigging likely it came from the lab" (Andersen). But they they met with Fauci, put out the Proximal Origins paper in Nature saying it was natural, after which Andersen got an $8m grant from Fauci.
There was also a letter in the Lancet saying "We stand together to strongly condemn conspiracy theories suggesting that COVID-19 does not have a natural origin".
Qualified virologist of the kind you mention are almost entirely funded from government or similar sources and letters like that pretty much say that if you say if came from the lab you are a conspiracy theorist and lose your grant and job.
Science is supposed to be about the truth about nature found through experiment, not via politics. The whole thing is totally corrupted and Proximal Origins a fraud.