The Wuhan Institute of Virology was trying to find viruses of pandemic potential to try to then proactively develop vaccines for them. This involved genetically engineering viruses to see how much they would need to evolve to become really dangerous. We know this because of their papers and grant applications, public record.
So far so good.
Reckless experiments, but not actually a bioweapon. And then via sloppy hygiene it leaked. Very simple. Leaks happen all the time in biolabs.
The technology to do this has only been accessible for a few years, and out pops a super virus.
Where is the evidence of this? Do you know how many lives China lost to SARS and if you do, do you still think the Wuhan lab would treat this with anything but the highest level of security and containment? China, if nothing else (lacking creativity, copying etc etc), can get quality control right.
"Well, if you can't believe what you read in a comic book, what *can* you believe?!" -- Bullwinkle J. Moose