If you’re familiar with the Broken Windows theory of policing, you may have learned of it, perhaps indirectly, from Malcolm Gladwell’s bestseller The Tipping Point, published 25 years ago. In the book’s most-discussed chapter, Gladwell sought to explain why New York City, in the 1990s, suddenly experienced the greatest drop in violent crime ever recorded. True, other cities saw crime declines in this period, but nowhere else did crime plunge so significantly and so swiftly. In just a few years, New York went from being one of the most dangerous and frightening big cities in America to one of the safest. Why?
