But to the extent white people have a "problem" joining in the Black Lives Matter movement they demonstrate their lack of understanding about the history of the United States and how (white) racist institutions functioned in the past and how they are evolving in the present. People need to ask themselves why they are so uncomfortable with the assertion that Black Lives (should, but do not currently) matter in terms of protections in American society. They are uncomfortable because they know they enjoy rights and privileges that are denied their fellow citizens who are Black and they fear the loss of those privileges. White (supremacist) psychology is dependent on the idea that there are groups of people (rightfully) not as equal  before the law as whites due to biological inferiority. How many white Americans still believe strongly in the notion of race but dispute the existence of racism? Intellectual retardation runs deep in white America.