“Justice will bring peace,” Lesley McSpadden said during a television appearance this week. Ms. McSpadden is the mother of Michael Brown, who was shot and killed by a police officer in Ferguson, Mo., on Aug. 9. While the focus now is rightly on the circumstances of the death of the 18-year-old, whom friends called Big Mike, the anger in the streets appears to be equally about how those in authority in this country treat people of color, particularly young black men.