Do you think this only affects black people? Or do you think it more accurately affects poor people, of which a disproportionate number are black?
If you acknowledge that it's the latter, what do you think happens when you address the poverty, even if you do so without respect to "race"?
Do you think only black people are impacted by police brutality? And do you think the impact is totally unrelated to the area you live in or how much money you have? Do you think that the disparities in health outcomes for black people have nothing to do with the level of healthcare/insurance they can afford? Do you think, if Oprah had chosen to have kids, she'd have been 3x more likely to die in childbirth as your average white woman?
Addressing class issues, fixing the problems caused by wealth inequality across the board, is the fastest, most effective, most politically expedient way to help the black people who are most in need. It will also, as Martin Luther King pointed out, help "a large stratum of the forgotten white poor."
The problem I'm pointing to, and the one you seem to be demonstrating, is that too many people got so focused on white people as the enemy, they couldn't bear the thought of helping poor white people and bringing them onboard, even if doing so would have disproportionately helped poor black people.
And what did it get them? Seriously, even from a purely self-serving perspective, what did all those millions of dollars and marching in the streets do for black people or achieve toward ending racism? I will never understand why more black people aren't mad about this extravagantly wasted opportunity and asking themselves serious questions about why it happened.