What is the main idea of this paragraph?

We are on the threshold of a new century, a new millennium. What will the legacy of this vanishing century be? How will it be remembered in the new millennium? Surely it will be judged, and judged severely, in both moral and metaphysical terms. These failures have cast a dark shadow over humanity: two World Wars, countless civil wars, the senseless chain of inations -- Gandhi, the Kennedys, Martin Luther King, Sadat, Rabin -- bloodbaths in Cambodia and Nigeria, India and Pakistan, Ireland and Rwanda, Eritrea and Ethiopia, Sarajevo and Kosovo; the inhumanity in the gulag and the tragedy of Hiroshima. And, on a different level, of course, Auschwitz and Treblinka. So much violence, so much indifference.