>How else could any human or organization function if not by acting in ways they believe are right?
Being convinced that you're always right is not the same as doing the right thing or acting the right way.
>The nation isn't perfect, but does anyone really believe that, on net, America hasn't been a force for good in the world? What is your benchmark?
Hoo, boy. No, America hasn't been "a force for good in the world", because that's a really naive, simplistic idea. America has done many things in (and to) the world. Some of them have been good for certain groups of people at certain times.