I won't bother reading 7 pages of what I'm going to assume are race arguments. Instead, I'll take this little spot on the board as a chance to say that I actually see their issue, and I empathize. Many of you are probably way too young to remember (hell even I am... almost) but Kirk Douglass played a Native American in a movie once, in fact if you look back on movies made in the 60s-70s you'll find that many races/nationalities were depicted, rather rediculously, by white guys.
Kirk donned brown makeup, as did his co-star and leading lady, accentuating this absurdity was his chiseled jaw, cleft chin, and other very caucasian features, even bright blue eyes. John Wayne, in 1958, played Genghis Khan. In 1931 Warner Oland (Swedish) played a Chinese man named Charlie Chan.
This isn't anything new, but it is rather silly, and it is a bit racist. I can get wanting to cast the better actor for the role, but what if Ororo Munroe had been played by, say, Natalie Portman in blackface?
And before anyone get's testy, I know Eddie Murphy did it a lot, but his work was characterizing and comedy, not drama, or action, or anything that could be construed as "srs business".
2¢