20 years ago today in Rwanda, began the worst genocide of the 20th century’s second half. Today, we’ll breakdown how the genocide happened and the intentional decisions of the U.N. and Western powers not to stop it. We’ll spend most of the hour with a talk we had, 10 years ago, with former Canadian General Romeo Dallaire. He was head of the U.N. peacekeeping team in Rwanda during the 1994 genocide. Today he’s a senator in the Canadian Parliament and author of Shake Hands with the Devil: the Failure of Humanity in Rwanda. Dallaire’s impassioned pleas for help to stop the killings and his outspoken criticism of the world’s response to the crisis have earned him global respect. PHOTO: Students from a nearby secondary school come to see the recently discovered bodies of victims of the genocide brought to the Church of Nyamata Saturday March 27, 2004. The memorial houses some 20,000 bodies of people killed during April 1994 genocide. (AP Photo/Ricardo Gangale)