She argues that if city planners persist in ignoring sidewalk life, residents will resort to three coping mechanisms as the streets turn deserted and unsafe: 1) move out of the neighborhood, allowing the danger to persist for those too poor to move anywhere else, 2) retreat to the automobile, interacting with the city only as a motorist and never on foot, or 3) cultivate a sense of neighborhood "Turf", cordoning off upscale developments from unsavory surroundings using cyclone fences and patrolmen.
And that is the American city. I keep comparing this scene to Assisi, where it's difficult to imagine such a thing. I'm becoming more and more convinced that traditionalism is best.