(Wall Street Journal) — This shrinking city needs to hang on to people like Johnette Barham: taxpaying, middle-class professionals who invest in local real estate, work and play downtown, and make their home here. Ms. Barham just left. And she’s not coming back. In seven years as a homeowner in Detroit, she endured more than 10 burglaries and break-ins at her house and a nearby rental property she owned. Still, she defied friends’ pleas to leave as she fortified her home with locks, bars, alarms and a dog.