A hypothesis for my new research on taste and class.
People who move to the bohemian or bobo (bourgeois bohemian) parts of the city when they first get out of college really like those places. They are not afraid of the city. These areas are among the most liberal places in the country. For themselves they are happy and enjoy the life and diversity of the city.
Kids, though, tend to make them more cautious. They will only stay is they are confident they can find a safe way to raise their kids. The educational level of the schooling matters, too, but is secondary. The ethnic diversity of city schools is usually a plus for these families. They are proud when they can find safe diverse schools.
Safety is what the suburbs sell - even, for these families, at the cost of a terrible blandness and unreality.