San Francisco, Hostage to the Homeless

Everyone’s on drugs here . . . and stealing,” an ex-felon named Shaku explains as he rips open a blue Popsicle wrapper with his teeth. Shaku is standing in an encampment of tents, trash, and bicycles, across from San Francisco’s Glide Memorial Church. Another encampment-dweller lights a green crack pipe and passes it around. A few paces down the street, a gaunt man swipes a credit card through a series of parking meters to see if it has been reported stolen yet.

For the last three decades, San Francisco has...