"The perpetrators of genocide dig up the mass graves, burn the bodies, try to cover up the evidence and intimidate the witnesses. They deny that they committed any crimes, and often blame what happened on the victims. They block investigations of the crimes, and continue to govern until driven from power by force, when they flee into exile. There they remain with impunity, like Pol Pot or Idi Amin, unless they are captured and a tribunal is established to try them."