It’s too obvious why. How can white families live in the city when you either have gangs pushing you out, your children are being harassed at school, your property values are going down, crime rates going up. So whites move out and then blacks complain that they’re “segregated” and whitey is keeping them down with no jobs, schools not getting enough funding, etc. don’t they realize they did it to themselves? In Chicago-land even moving to the burbs has made some of it inescapable because the mayor decided to tear down some of the public housing and spread them out to the burbs to live on section 8. Thankfully the few on my block don’t cause trouble (except for pot-dealing) but I hear the majority of his buyer’s are the older white people on the block lol. (myself not included.)
And there you make point which a lot of whites don’t recognise or refuse to recognise-the “good black family” moves in, but in their trail comes the baby daddy niece, the gangsta cousin, etc. Or even the primary family’s children.
There was a comparison done of Prince George’s Co (majority black middle/upper middle class) and a majority white, lower socio-economic status, more rural are. The majority black, higher ses area had higher drop-out rates, higher teen crime rates, and lower academic scores than the lower ses majority white area. This was so even when adjusted for single parent/two-parent families.