On Wednesday, May 1, Flossmoor resident Peter K. B. St. Jean, had the Flossmoor Community Church sanctuary filled with talk of community, vision and peace, following the walkout demonstration at Homewood-Flossmoor High School the day before.St. Jean, chair of the sociology department and director of the criminal justice program at North Park University, is a trained peaceologist. He believes the time he spent in the U.S. Army helped form his understanding of peace as a powerful tool for change.“I spent 12 years in the U.S. Army,” he said. “I was trained to kill. Now, I . . .