You guys have to remember that "Empire of the Summer Moon" the book was more of a history, meant to educate, rather than a book meant to entertain. Movies on the other hand are meant to entertaoin and be suitable for a broad audience, including children. If parts of the book are left out or "manicured", I'm sure that it would be to maintain the audience apeal that is necessary to make it a financial success and avoid movie ratings that would restrict or diminish the viewing audience.