Leonard Pitts: ‘You don’t have to be the hero’

"You don't have to be the hero."That, John Castillo told NBC News Wednesday, is something he had advised his 18-year-old son, Kendrick. If ever a shooter invades your school, son, don't try to confront him, don't take the risk. But Castillo said Kendrick had other ideas, telling his dad that he would not hesitate to defend other people's lives.As the world now knows, Kendrick was as good as his word. When two of the latest in this country’s seemingly endless line of armed maniacs descended