It was April 7, 1994 in Rwanda, 20 years ago today. After decades of inter-marrying and living in relative harmony, Rwandan Hutus rose en masse and began mutilating, raping, torturing and murdering their Tutsi neighbours, using clubs, machetes, acid, boiling water and the deliberate spread of Aids. By the end of just three months, the Hutu people had brutally exterminated three-quarters of the Tutsi population - an estimated 800,000 men, women and children.
But the perpetrators were not hardened criminals, nor did they have violent histories. Rather, they were ordinary people - farmers, active churchgoers, and teachers. Yet they were remorseless in the killings, believing that they were doing an important job by exterminating people they called "cockroaches", who they blamed for all of the troubles in their homeland.
The Rwandan Genocide was, of course, one of many wholesale massacres of the 20th century, an era some scholars call the "mass murder" century, during which more than 50 million people, or 100 million by some counts, were systematically killed by both soldiers and civilian combat.
Why did it happen? Although several factors converged to galvanise the Hutu people to commit the atrocities, among the more important was a powerful, privately-owned mass media, repeating messages of hate, fear and dehumanisation - and human psychology responding to situational conditions. Certainly, the Rwandan Genocide was not the only time when mass media were used in the aiding of mass human rights abuses. The architects of every modern genocide and mass atrocity used media to justify their ends and usually to disguise or cover up their means.