How to Forgive but Not Forget

On September 15, 2001, four days after the 9/11 attacks, Frank Roques sat in an Applebees in Mesa, Arizona and declared to his waiter, “I’m going to go out and shoot some towel heads.”

Frank then went home, loaded his guns into his truck, and drove around town looking for targets. He passed a Chevron station. Outside, a man with a long beard and turban named Balbir Singh Sodhi was planting flowers in front of the gas station he managed. Frank pulled into the station, got out of his truck,...