It's not clear during what time frame you grew up, but note that violent crime is dramatically lower than it was 30+ years ago.
It blows my mind that people are so uncaring about their kids' daily experience (mobility, independence, access to interesting activities, ...) as to move to typical American suburbs with their kids. The benefit of the suburbs is a bigger amount of personal space at home for the same price, but everything outside the house kind of sucks, especially for kids.
We're not necessarily the "techie family" you are imagining though; I spent about a quarter of my childhood in a medium-poor city in Mexico, and my wife grew up in China. Personally I really appreciate having a quite diverse cast of neighbors.