“The public peace—the sidewalk and street peace—of cities is not kept primarily by the police, necessary as police are. It is kept primarily by an intricate, almost unconscious, network of voluntary controls and standards among the people themselves, and enforced by the people themselves.” So wrote Jane Jacobs in The Death and Life of Great American Cities. Jacobs believed that a prerequisite for this type of healthy and engaged community was the presence of people who simply were present, who looked after the neighborhood. She has been proved right: disadvantaged neighborhoods with higher
  
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