The idea that the majority is under attack is reinforcing to anyone who stands on the brink of losing unearned privileges they have long taken for granted. It hurts to be taken down a peg, to discover you're no better, no more deserving, than anyone else. Better to lash out, mobilize the masses. Misdirect them at an imagined enemy. Anything to maintain that privilege.
Does a person whose ancestry is not Black have the "right" to exercise the option of living their lives as a "Black" person in America? And to what extent does that choice provide such a person with any advantages or privileges that are not available to other Blacks, who, because of their biology, have no option but to live their lives as Black?