Hitler did not discover anti-Semitism. Since the Middle Ages, Jews in Europe have faced bigotry and persecution, mostly for religious reasons. Christians saw Judaism as a heresy that needed to be eradicated. Jews were often compelled to convert or were barred from working in those occupations. Religion played a smaller part in the nineteenth century. That had Rega been Theories saying the distinctions between races and peoples have taken their spot. The notion that Jews belonged to a different people than, perhaps, Germans gained traction. And Christians who converted to Judaism were still 'different' due to their bloodline.
The main reason why Cambodian genocide perpetrators have not been brought to justice are the incompetent and alleged corruption of the local tribunal court, and lack of support from international community as well as the death and sickness of several witnesses and perpetrators.
