“No one has to sell us about the pleasures of a small town. We know them well, if not from reality, then from the old Andy Griffith Show, or It’s a Wonderful Life. But the small town we all know best is the one deep in our heart, with its elm-shaded streets, little clapboard houses and picket fences, and gnarled fruit trees and run-amok vegetable gardens, where doors are never locked, and where shopkeepers stand in front of their shops and greet you, and the cop greets you, all by name,