This is a clip from an episode of Start The Week on Violence and Conflict, hosted by Amol Rajan.
Just how violent are we as a species? The primatologist Richard Wrangham believes there is a 'goodness paradox': at an individual level we have evolved to become a more peaceful animal, especially compared to our closest relatives, the chimpanzee; but our ability to organise and plan an attack has made us lethal.
Producer: Katy Hickman
