Before I take these in reverse order, I thank you for reading and weighing in. First and foremost, Nate Parker stood trial for rape when he was in college at Penn State and he was acquitted. If a man is acquitted after being facing a jury trial that should be the end of it- especially since he had made several major movies with several major studios over several years without even a hint of 'controversy' about it. It did not become a 'controversy' until he decided to make the Nat Turner film.
As far as the history of enslavement of Europeans goes, I think you are sorely mistaken if you believe that the average White person knows nearly as much about that as they do about the enslavement of Black people in America. It is not even close. The condition of our public education in this country has produced a population of people that do not even have a command over the facts of American history, much less world history.
Finally, I encourage you to be very cautious and precise when drawing comparisons between American slavery and the world-wide conspiracy of nations that produced it and any other brand of slavery that has ever existed in the world. I know Thomas Sowell is very fond of doing that but he is as wrong as he can possibly be. Even if he may be right on a few other issues.
I suspect that arguments along those lines only find purchase with Black people who are more desperate to curry favor with White folks than they are to actually have a constructive dialogue. Maybe I lack the imagination to see how any child of European descent is living a life scarred by any enslavement endured by his or her ancestors. Or perhaps there just aren't any. So bringing it up is only designed to minimize the experience of Black folks and escape uncomfortable conversations.