Inherently? Of course not. But in practice it tends to act as a good prior for detecting bullshit. How many of these people would really be making the same argument in this way had the virus appeared in Bonn or Montreal?
And again, to repeat: in this particular situation we have a very acceptable, very convincing, very obvious hypothesis for covid origins that simply does not require trafficking in badly-motivated argument.
At the end of the day there's no strong evidence, we all agree on that. So I choose to believe something obvious that fits the data and patterns previous events, and others... choose to believe that a (literal!) conspiracy is afoot acting to cover up wrongdoing by an evil foreign nation. And that's bad.