(CBS) – Bashar al-Assad destroyed Syria in order to remain its president. The dictator, son of a dictator, has committed every war crime on the books; bombing civilians, gassing neighborhoods, torturing prisoners. An estimated 400,000 people have been killed in the civil war and 11 million forced from their homes. Last December, with his allies Russia and Iran, Assad occupied the ruins of Aleppo, Syria’s largest city. Various rebel groups continue to fight, and Assad means to break them with another war crime — the destruction of hospitals. Standing in Assad’s way are courageous doctors, many of them American volunteers, risking their lives to heal the wounds of war.