True but if you notice, it has been used that way in the same thread by others as well.
You still don't notice that my point had nothing to do with punctiation and whether you format it as US, U.S. or USA?
Okay, then my make my point more directly:
There are a lot of people in the US. They have all sorts of different interests and persue all sorts of agenda's.
If you say "the US has a secret agenda" then you should be able to specifiy about which of those people in the US you are speaking.
Why is this valuable? Merging all those different interests together into a single ideal actor that's called "the US" is a simplification. That simplication prevents you from seeing how political decisions get made.
Understanding how political decisions get made is the basis for understand motivations for decisions.