Earlier quoted context omitted.
You did mention racism but I would also say racism was a driving force since before white flight. The government precursors to Fannie mae and Freddie mac wouldn't back mortgages that banks created in redlined areas. And the precursor to HUD created segregated public housing, including in the west. The Federal government was pushing redlining and segregation in housing since at least the Great Depression. A lot of thi…
There were plenty of people liberal enough or cheap enough to live in a black neighborhood. Many tried. But they wound up 100% black/0% white anyway.
What that also mean is that if one black family moves into white street, every white on that street is at risk to loose exact same things. They become redlined too.
Redlining means that white people have financial incentive to segregate themselves and to push away incoming blacks. Liberal might not mind living with blacks, but will mind being unable to take mortgage he would be able to get otherwise.