Can we do evil without being evil? Many were shocked at how ordinary nurse and serial killer Lucy Letby seemed — but others say this is the very nature of human wickedness.
The nurse who became UK’s worst child killer
Sentenced: Lucy Letby is only the fourth woman in the UK to receive a whole-life jail term. Glossary
Hannah Arendt - A Jewish German political philosopher who escaped a concentration camp and fled to America. She wrote extensively about Nazism.
Adolf Eichmann - The senior Nazi in charge of organising the deportation of Jews to extermination camps during World War Two. He was convicted of crimes against humanity and hanged in 1961.
Judith Shklar - A 20th Century American philosopher and political theorist.