I would suggest that you place to much emphasis on your own opinion rather than taking 'a step back' and looking behind the scenes.
Nothing is certain in the social world.
Thus your statement of certainty about the lack of unity in the black community, being a result of a lack of unity in black families, is an unsupported conclusion to say the least. There would be any number of contributing factors to this phenomena. This may cause a distinct, underlying resentment from those who cannot afford to escape from the areas where the white majority has forced them.