Afram males are one of the worst off demographics in the US with the highest rate of crime, incarceration and the lowest rate of educational achievements and income. As a non US citizen my outsider perspective is that aframs (expecially male ones) have never really integrated into mainstream american society. The most evident sign of this is their accent: 2nd generation latinos and asians have a regular american accent with regional differences depending on where they grew up, but blacks, regardless of where they're from in the country, have overwhelmingly a black accent, sometimes thick, sometimes less pronounced. I can tell you that 2nd generation blacks in Europe don't have any peculiar accent except for that one of the place they grew up in.
I understand that blacks developed their own culture because of segretation but segretation ended two generations ago and yet nothing really changed, certainly not accent-wise but even in regards of other social and cultural aspects not much really improved. My personal impression is that the political establishment (expecially the leftist establishment) doesn't want blacks to integrate into mainstream US culture. They've tried their best to make blacks a separate reality from other americans through any form of propaganda, expecially de-responsabilization via pc rhetoric and discouraging them to bond and to assimilate with whites through culture, particularly entertainment. They promoted the large diffusion of hip hop among aframs and discouraged them to listen to other genres like rock and even their own creation, blues who's been totally discarded in the black community. Music is a powerful way for people to bond from a young age and blacks and whites rarely do it with each other. Hip Hop culture had a moderate degree of diffusion among whites but it's stil a black thing. Let's not forget the promotion of genres like gangsta rap which glorifies anti-social ghetto behaviors and certainly doesn't encourage educational achievements, hard work and commitment.
The left (and to a certain degree probably even the right) doesn't want blacks to advance in society: if black people started advancing professionally, socially and career-wise, they would start to shift their vote towards fiscally conservative parties which is typical of middle-class people who don't want to spend their savings paying for the welfare of others. Black Americans grow up with the constant refrain that society is racist and stacked up against them to the point that they would never improve their situation at large so why bother anyway?
It's a complicated issue that impacts primarily on black males and I'm not confident it will change any time soon but I was positively surprised that listening to Thomas Sowell I found many confirmations to my impressions.