By Jane Franchi. Ex BBC Panorama. This program traces the history and background of Thomas Hamilton, the man who walked into a primary school in Dunblane, Scotland, and killed 16 children, their teacher and himself. It also tells the story of the young victims and some of their families. After the shock and mourning comes the question, why? How can people commit such horrendous crimes and what can be done to prevent them in the future?