Ok but they can do both, right? I mean, I can improve my performance by looking at my own performance, but also watching others.
Moreover, the US can exert a lot of pressure on other countries to meet certain standards and reduce risk. Knowing what went wrong will help determine standards.
It's not like lab-leak-causes-disease only happens once. This happens all the time, just like aircraft incidents. If incidents weren't investigated and tracked, planes would be riskier than they are.