Looking over one of the worst crimes scenes in the history of downtown Indianapolis, state trooper Rod Russell was sad. “It’s just a few people who make it bad for everyone,” Russell said. But the “few” were thousands of blacks who roamed the streets of downtown in the aftermath of an Indianapolis Black Expo marred by fighting, vandalizing, assaulting and even shooting. Lots of shooting. Ten people were taken to local hospitals with bullet wounds. “Why did we find an AK-47 in the back of someone’s car,” asked Frank Straub, director of public safety, about the 2010 rampage. No one...