Opinion writer John L. Micek says there is no silence like the silence of a house where a child once was. Marge LaRue should know. Last fall, her grandson, Nicolas Elizalde, was a victim of gun violence – shot and killed outside Roxborough High School in Philadelphia. It came just after the end of a junior varsity football scrimmage. Nick was just 14 years old. Four other teens, aged 14 to 17, were wounded.