[tptacek]

No, mostly what zoning was intended to do was to keep Black families (and, before that, Chinese families) out of white suburbs. The documentation on this point is extensive and convincing. That effect is less deliberate, overt, and intensive today than it was in, say, 1964. But "we've always done it this way" is a uniquely weak argument when it comes to single-family zoning.

(The problem, throughout most of America, is lack of multifamily zoning; it's not as much that people own single-family houses near multifamily lots, because their grandparents generally took care of that problem in the late 1940s when most major metro areas got rezoned to eliminate those multifamily lots).