I read an article on the exhibit controversy several years ago. The head of the project was trying to defend the politically correct display of the Enola Gay the left was trying to get. His biggest argument was that it's not the job of the Smithsonian to showcase America in the best light possible. Turns out he was 100% wrong. It's in the Smithsonian's charter that they are supposed to show America at it's best.
The exhibit guide/presentor definitely had an ax to grind, but was shocked by my questions. Her inability to answer them, I think, was embarrassing. Those present saw the agenda blatantly for what it was, but there were several more tours that day and many, many other days no one questioned her expertise.
What other country not only allows such dissension, but pays for it as well. Sometimes I wonder about how such freedom can survive.