Earlier quoted context omitted.
An eerily prescient quote from a paper[0] published in 2015, two of the authors of which are with Wuhan Institute of Virology: > Understanding the bat origin of human coronaviruses is helpful for the prediction and prevention of another pandemic emergence in the future. China has clearly contributed valuable research into bat coronaviruses. They had all the motivation to look into these after the first deadly SARS. I…
My naive reasoning on why China didn’t create COVID-19 with the intention of using it is that I suspect (unburdened by education or the thought process) that engineering a virus is as difficult as coming up with a vaccine or treatment. If you are developing some kind of super virus to shut down the world economy and then immunize your own people to take advantage of the situation, wouldn’t you have the cure ready to…
It's a pure mapping problem. There are thousands of known viruses that affect humans. But most viruses don't have thousands of vaccines.
Additionally, there are constraints. The only contraint on a virus is that is needs to reproduce, and cause harm. Any kind of harm will do, and any kind of spreading is fine. But the vaccine needs to not hurt the person (at least, don't hurt them worse than the virus would).
Even if both processes involved similar techniques, the constraints on virus production are more favorable to the researcher than vaccine production.
To get back to whether China or any nation would intentionally create a biological weapon, however...: most industrialized countries realized a long time ago that bioweapons tends to be a bad strategy. Most western countries stopped their bioweapons programs back in the 70s for the simple reason that there was no reasonable use-case for a bioweapon that isn't done better by simply bombing something (or more recently-hacking their infrastructure). Bioweapons are strategically useful for small nations, and terrorist groups.