This article points out that a lab outbreak could have happened in the United States and many places in the world. We need to avoid demonizing China over this if we want to ever find out the truth and learn how to prevent another pandemic outbreak.
[1] https://web.archive.org/web/20200214144447/https://www.resea...
So there are only two alternatives, and we just need to compare which sounds more likely? Or could it be that you exclude about a million other alternatives here, while also ignoring that just a little bit more information about context often makes unlikely scenarios more likely and vice versa?
Not arguing any of the theories here, just looking at the approach. The first task might not be to make assumptions, but to understand the situation better.