There's a hitch in your logic: The US IS the good guys: Freedom-loving, freedom-protecting, doing what's right good guys.
China is an oppressive murderous communist regime.
The US is good, China is evil.
So your premise doesn't hold up.
So your premise doesn't hold up.
But how does one logically prove a statement of the kind "X is good" (independent of "Y is evil"). Mathematically (predicate logic wise) speaking, Proof by intimidation, Proof by personal-belief and Proof by assertion / repeated-reassertion don't hold up either.
Consider this philosophy: I am good. Because I believe that to be true. Thus, what's good for me is good for the rest of the world. And anything else is bad. So, I now use my might whichever way to annihilate the bad.
Anyway, (ostensibly) the US has taken upon itself, the role of championing freedom and democracy across the world. There are probably no better beacons than its founding fathers, to guide its actions while playing that role.