I tend to think that whether you have a Liberal or a Conservative mind-set exerts as much influence as race when it comes to an abuse of power. White Liberals, for all of their patronizing, paternalistic shortcomings, still have good intentions and are about helping the underdogs that include minorities and gays and immigrants, not to mention the poverty-stricken.Their black counterparts are equally compassionate toward their fellow blacks. On the other hand, white Conservatives smugly believe they can attribute any success they have to pulling themselves up by their bootstraps and so do Black Conservatives and they fault other blacks who haven't been lucky enough to make this work for them. Moreover, they have no problem sucking up to white Conservatives, hoping to pick up pointers on how to be treacherous.
Of course these are generalizations. I think it was black sociologist Frances Cress Welsing who theorized something to the effect that white people have never recovered from being ostracized and driven out of The Tribe by blacks because their white skin was considered an aberration. Resentment over this possibly became rooted in the DNA of whites, subsequently making them driven to dominate and exploit dark-skinned people to cruelly avenge this slight millions of years ago.
Bottom line is that when push comes to shove, everybody covets power but some are more inclined to use it for good than others.