The fact that one of the greatest master pieces of the history of film is mostly seen by it's unavoidable elements of racism tells us how art can be sacrificed by the contradictions of non artÃstic elements (even if they are relevante as they are). Much more relevant is to acknowledge the true birth of film language, and this film mas so many moments: but the wideshot of the battle is something I've never seen on film - even in a film where racism, and slavery, are taken as natural narrative elements. In the exact same way as Leni Riefensthsl's The Triumph of the Will, made for nazi propaganda, is still a great film. Or any other American Western where Indians are Always seen as savages.
Art is art, racism is racism. But also memory is memory.