You claim that white people, in absentia, are responsible for the problems that are created after they leave a place. This is clearly obtuse.
Jackson, MS is a perfect case. The water was undrinkable after all the white people left. Therefore it's white people's fault.
Black folks aren't entitled to live near white folks. They aren't entitled to benefit from the tax dollars that come with the white folks. "White flight" is simply leftist branding of a common-sense reaction to watching one's neighborhood fall into ruin.