Finally, finally, the over-long, ten year trials of the leaders of the murderous Khmer Rouge leadership of Cambodia, are over. The two defendants, Nuon Chea, and Khieu Samphan, were each given a life sentence at the end of the first trial in August 2015 for crimes against humanity. Now last week they were convicted of genocide. Of the other three that were tried, one, the ex-foreign minister, Ieng Sary died in 2013, one, Ieng Thirith, the wife of Ieng Sary, was too ill with Alzheimer’s to appear and one, Kaing Guek Eav (“Duch”), voluntarily confessed three years ago and was sent to jail for 35 years. In the twentieth century, two massacres of hundreds of thousands people compete for second place after Hitler’s extermination of the Jews, Poles, homosexuals and gypsies. One is Cambodia and the other is Rwanda. But Cambodia, where the deaths were between a million and...