Star wars: The portrayal of minority and female characters

[Aractus]

First off, what does sameul jacksons skin color really have to do with anything? Also, darth vaders skin color has nothing to do with his alignment, its because he has 2 pasty white kids. Black parent != White kids, not how gentetics work. Also that particular moment to which you refer hardly makes mace windu morally ambigious because he knew that to put the emperor on trial would mean the death of the republic.

Okay, I'm just going to answer the Darth Vader question. In the first two movies he's evil, and he's black, and voiced by a black man. In Return of the Jedi he's still evil, and still black, and still voiced by a black guy. But when he is redeemed and comes back to the light side, his son removes his mask to reveal a white face. When he was on the dark side everything about him was black, when came back to the light side suddenly he's white. And for the first, and only time, in the original trilogy, he's also voiced by a white guy instead of a black guy. Given that this colour theme runs out throughout the entire trilogy - even in terms of the spaceship interior colours (black & battleship grey for bad, white for good), I conclude this was an intentional doing by George Lucas.

This leads us nicely back to Samuel L Jackson - he's the black speck in the white section (the Yang) of the Yin and Yang. And so, for that matter, is Lando. He is the black speck of Yin in the white Yang.