Except you don't fix one problem by creating another. Let's face it, this is the wrong crusade to be on. You don't suddenly cast blacks in white roles just to spite all the whites that might have played blacks in the past. That doesn't help equality, it just creates throws the balance the other way.
We can't change what happened in the past, people need to learn to accept it, learn from it, and move on to better things. Accepting it also means to properly protray it. There's nothing racist about Norse culture because they are all pasty white, that's just a fact of life for them, living as far north as they did. Making a movie about their culture and mythology and casting all white people is not racism.
Did anyone say anything about Black Nick Fury (Samuel L. Jackson) ? In the comic books, Nick Fury was a white guy. However, he's just some american guy, so his race doesn't matter, there's a lot of diversity in America. Nick Fury makes sense as any race.
