Short answer:
You are misreading history by a mile.
My Grandfather actually was one of the first people to participate in one of these full section deals in the late 40s and early 50s in Dorchester and Southie in Boston on behalf of the family company and family trust. he also was one of the first of his family to go to college - for accounting, courtesy of the GI bill, post ww2.
2 things pushed these deals together
1) almost all the buyers were becoming/were middle class blacks/on their way, courtesy of the GI bill/backwages of ww2 and Korea. Southie wasn't redlined, and they went through friends of friends to buy in order to become landlords, not to live there.
2)As part of housing shortage/great society issues, section 8 was introduced, and a number of buildings involved were going to be zoned/legally obliged to take and early version of section 8.
Group 1 didn't run the numbers very closely, my grandfather did. The buildings would have become effectively slumlord properties. My grandfather wanted no part of that. He also assumed the following:
Surrounding 1-2 family house prices would start to drop as the rumor mill started to fly.
Which would buy him time to move.
That prediction proved to pretty much be true with the passing of multiple laws in the 60s surrounding housing and the creation of HUD/expansion of the FHA.
As a result, my father actually spent the first 2 years of his life in Southie/Dorchester before his family moved to Milton.
The primary buyers my grandfather sold to did not hold onto the property for very long, for obvious reasons. People like Anna, especially if they were first wave buyers, did not feel like they were dispossessing anyone since at the time it wasn't clear if these sorts of housing acts were going to pass/what was going to happen involving integration (which was happening roughly towards the end of the 60s). At best, from what I can tell it was about starting to join and integrate into the country, not dispossession.