Unfortunately so many have an innate bias against the US that any criticism of it is considered fair game regardless of how conspiratorial or absurd.
That's not true at all. Rather, there's randomness around what gets flagged and/or moderated. People read into that whatever patterns they want to see, or are already convinced are happening.
For what it's worth, one of the names on that paper is Shi Zhengli, one of the lab’s top researchers who is now defending the lab to the media:
[Shi Zhengli] said on her social media account that she “guaranteed with her own life” that the outbreak had nothing to do with the lab but was a “nemesis for the barbaric habits and lifestyle of some people – like eating wild game including bats.”
https://asiatimes.com/2020/02/coronavirus-lab-leakage-rumors...
EDIT:
As I noted in my other comment, these researchers didn't actually create a new coronavirus, but rather a much simpler and safer virus purpose-built to test some receptor-binding structures.