Interesting discussion Azizi. I teach in a practical nursing school where many of my students are African immigrants or children of immigrants, so when I teach classes on cultural diversity I usually feel that my students know much more about this subject than I do. Still, many of them don't have much of an understanding of how the history of slavery and bigotry here in the US still influences people's attitudes and behavior. When talking about the "one drop theory" I couldn't resist pointing out that such an attitude actually is expressing the fear that the "African blood" i.e. heritage is *stronger* than any amount of "white blood."
To me this is an example of the underlying/unconscious fear that any group of oppressors must feel toward any people they are mistreating. Underneath all the bluster about the innate superiority of the group doing the oppressing is the realization that, given the opportunity, the oppressed could oppress the oppressors in exactly the same way. Fear twists human thinking and behavior in such strange ways.