I'm proud of American history, and prefer to think of the dark times in our nation's moral quest as the times that made us strong. Our detractors can't speak about our criminal institution of slavery (and both North and South were equally guilty of slavery, I insist) without facing the Civil War -- where Americans murdered one another at a rate that's never been equaled even in WWII. Let anyone spout off about the crime of slavery as if it were our fresh sin while they're standing on the hallowed ground of Gettysburg.
They can't talk about our oppression of the Indian without understanding that Indians are today some of America's staunchest patriots. Invite a modern left wing anarchist or Osama bin Laden to burn our nation's flag on the Navajo reservation and see what happens to them.
They can't point to our internment of American Nisei in WWII without running face-first into the history of the 442nd RCT -- the toughest US Army outfit there ever was -- and the fact they're the most decorated military unit in our history, and God help us, I hope they stay that way for our future soldiers' sake.
Also, they can't point to our nation's treatment of Italians, Irish, Scots-Irish, Scandinavian, Spanish, or Polish immigrants. Everyone had to prove themselves in America. Some got it worse than others, but we're not the nation that tortured those people. We're the nation that matured from what we've done. I hope our troops never see a bloodbath like they experienced ever again.
Other nations have to live in shame of what horrors they've perpetrated on the world. Only our good graces have forgiven the Germans for their horrors, or the Japanese for their rape of China, or China for their mass murder of their own people in building pot metal statues to their ridiculous dictator, or Russia for it's 80 year hiatus from humanity and spreading their poisonous doctrine to all reaches of the planet --- But in America, we resolved our own problems by ourselves, and that's something to be proud of.
So no, let Ken Burns show that stuff. He's not pointing to our open wounds. He's showing us our own hard-earned battle scars, and our enemies and detractors better take note.