Ugandan academic Mahmood Mamdani sees a link between the violence of the coloniser and the slaughter of Jews and Slavs by the Nazis. The racial theories of Houston Stewart Chamberlain and others who claimed the Aryan race was superior meant that Jews and Slavs, who were both regarded as not Aryan, could be placed beyond the pale of civilisation and were thus candidates for the “laws of nature”, not of war. According to Mamdani, in the Second World War, the Nazis “observed the laws of war against the Western powers but not against Russia”, and not against Jewish civilians and...