The main point that no scientists seems to want to mention is the clear cut and well defined conflict of interest in determining the origins.
How would the scientists of the future ask for funding if it turns out they themselves directly caused an epidemic? It is a black eye for science, it provides ammunition to the "anti-science" crowd.
In contrast scientists are in the drivers position if the cause was all natural. Then they can propose to be the "defendenders" of the humanity against the next danger.
No wonder that there is strong headwind against any other narrative. Remember all it takes a single dissenter to bury a paper.
It is the in the vital (short term) interest of every scientist to say that the origin is all natural!
If you read the papers that claim natural origin, these turn out to be extremely weakly argued. A heat-map plot here and there, some evasive language when it comes to evidence. But the quotable conclusion is always formulated much more strongly.