You’ve pretty much identified the root cause.
The one NOBODY in the media or black “leadership” will talk about.
We can thank Lyndon Johnson for this evil outcome.
The “Great” Society destroyed the black family structure in the US.
And it was all part of a plan.
“These Negroes, they’re getting pretty uppity these days and that’s a problem for us since they’ve got something now they never had before, the political pull to back up their uppityness. Now we’ve got to do something about this, we’ve got to give them a little something, just enough to quiet them down, not enough to make a difference. For if we don’t move at all, then their allies will line up against us and there’ll be no way of stopping them, we’ll lose the filibuster and there’ll be no way of putting a brake on all sorts of wild legislation. It’ll be Reconstruction all over again.”
“I’ll have those niggers voting Democratic for the next 200 years.” ~ Lyndon B. Johnson to two governors on Air Force One