But why don't they move to a more inner suburb?
People who live in the city are used to having crossing guards at every street corner, so they accept nannystatism. They reason that were it not for the state, they would be limited to their own block and couldn't work or get food. They have effectively become both physically and mentally crippled.
Those who live in the exurbs, realize that after they drive down to the mailbox to pick up their mail, that they can keep on going and drive to the Walmart or their job at the munitions factory. They become empowered and self-reliant.
Presumably they built those roads themselves.