Build a suburban "gated community" for safety, give everyone a huge lawn that they're obligated to constantly maintain, don't allow any commercial buildings in because they're considered ugly, and you get an environment where it's pretty tough to get anywhere without a car. Add in the poor pedestrian infrastructure, intimidating high-speed traffic, and some irrational fear of how anybody under 18 out of eyesight of a parent for a second is about to be kidnapped, and you get a neighborhood where everyone seems actively discouraged from knowing anything about their neighbors. Seems to me that this is what creates the unsafe environment that everyone was trying so hard to get away from.
It's interesting to read that many suburbs may also be logistically unsustainable.