One of the positives of the segregationist system was that it allowed black owned businesses to thrive with a captured market of other blacks. A White owned store wouldn't let them in, and no White is going to shop at black stores, so every black neighborhood had stores owned by, worked by, and made for blacks.
It also enforced a greater sense of community and unity for the black neighborhoods, along with a sense of investment and township that translated to lower (not as low as White levels but lower than today) levels of criminality and sloth.
The evils that SJWs bemoan today like gentrification, 'cultural colonialism/genocide' and lack of generational wealth can all be traced back to the end of segregation. Black businesses failed when they had to directly compete with White or (((white))) owned businesses, destroying stores of wealth and commerce. The lack of economic lifeblood and hard segregation disintegrated neighborhoods and scattered communities that withered without that cohesion. The cultural and familial ties of the black people, once out of their capsule, dissolved in the solvent of the dominant and superior White culture.
Now that they have suffered for decades they want to bemoan discarding their only means of protection. Well fuck those ungrateful apes, ship them back to Africa.