That situation isn't analogous, but American Airlines would reduce its risk more by reading its own incident reports compared to Delta's, yes. In general focusing on one's own failings is superior to focusing on another's.
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.
Are you serious?