When you love something, like I love my wife, I don’t see her as infallible or perfect, because any mistakes they have made or will make will cause you to resent the imperfections.
American history is rife with imperfections (to put it lightly). The Trail of Tears and Native American genocide, slavery, wars of imperialism, the list goes on and on. If we can’t or won’t reconcile the horrors of our past and learn from them, there’s no way we, as a society, can move forward.