Riddle's ethics

Why are humans cruel? In order to stir up fear of the Muggles and gather his first followers, Tom Riddle has to come up with a clever explanation, but Dumbledore pulls him into the depths of ethics. What are the triggers? A dinner at the Lestranges', a war of words between two arch-enemies and the Auschwitz-Birkenau concentration camp. - The transcript of an evening -