Are you saying its not possible to have black people in close proximity to each other without problems?
People in wealthy silos, in downtowns, do fantastically. The problem was the systemic racism in the US, that enabled such a state of disinvestment and segregation, not the particular form of architecture.
The problem of public housing's inaccessibility, being cut off from jobs and basic necessities, is well documented. Segregation has been a huge problem in the US because it has been used to deny basic opportunity to Black people, not because a lot of Black people are living together.