Well, to believe it is not a bio-weapon, you have to believe that you can throw a deck of cards up in the air and for all the aces, and only the aces to land in a small circle you drew on the ground... it could happen.

All the pieces of the Cov-Sars2 can be found in bat viruses.

However, the mutations of the "add a feature" really only happen in a lab.

Further, to believe the CCP story, it started in a wet market... that hasn't sold bats for a decade. But we don't know that because the market has been sanitized out of existence. (no researcher was allowed in the area to look for anything)

The level 4 lab in Wuhan was studying bat viruses and patented a Cov-Sars virus.
One of their lab people, considered to be patient 0, has now had all of her information scrubbed from the website and anything else under CCP control.

China had several viruses going around, and no lockdown.
This virus gets out, and as soon as the CCP learn about it, the start to lock things down (except flights to other countries.)

And, one last thing. Each species has their own diseases which for the most part never go to another species. Not without human help. (this is an energetic / life thing. It will be common, priema-facia knowledge in the future)