Reaction to the grand jury decision this week not to indict Officer Darren Wilson in the shooting death of Michael Brown was immediate and widespread — and left opinions at odds. In cities and states many miles from Ferguson, Mo. — the St. Louis suburb where Brown, an unarmed black teenager, was shot multiple times by Wilson, a white officer in a predominantly African-American community, in August after a violent altercation — protesters have emerged on urban streets, and the relationship between local police and the residents they serve has come under stricter scrutiny. It’s been most visceral, of course, in minority neighborhoods.