When the suburb of city in which I live integrated in the mid sixties. The real estate listings were in agate type. Who were those who fled? Mostly liberal Jews who were advocates of integration except where they live. They cried, "The schools will go down." They were prophetic The schools did decline from the top in the state then to practically on probation.
Check the "lily white," burbs of any major city (think Chicago) and you'll find that they are populated by a lot more than Conservative Christians. Seems like a lot of the liberal elite reside as far from the city limits as possible.