February 1, 2011 --I had an interesting conversation with several newsroom colleagues last week, involving the question of when it's OK to let your children begin riding public transit. One of my colleagues has a 15-year-old son who has to get into Center City to take a university-level writing course. He wants to take the train downtown from their home in the suburbs. She's concerned that he might be a target for bullies or other criminals. Her concerns were magnified once she saw the video of Upper Darby bullying victim Nadin Khoury being attacked.