If you want my opinion on that, check my post way down there from Jan. 2nd, responding to Blair in the "what do blacks not want as white rasta objectives" thread.
To me it all boils down to power- who has it and who doesn't.
It ain't just skin color (although obviously that's a huge part of it), cos there are black people who seem very 'white' to look at, and there are dark-skinned people in Sudan (who insult the prophet Muhammad by calling themselves 'Muslims') who are playing the role of whites, enslaving non-Muslim Sudanese. Many of these 'Muslims' are light-skinned, but some are just as black as the people they're enslaving.
It ain't attitude or beliefs or nothing like that, cos there's a huge variety of attitudes and beliefs in any 'race'.