Things make more sense when you take a look at the post-WW2 black population growth in the Bay Area compared to the rise in interest in "local control" growth policy and the timing of some famous "Progressive" votes like the Freeway Revolts: https://i.imgur.com/6F0gP4l.png

I certainly can't speak to _intentions_, but I can observe the result of how basically every decision taken since the '60s has worked to maintain the segregation that used to be legal at the time: http://www.radicalcartography.net/index.html?bayarea