Why humans are violent

John Gray reflects on the nature of violence which he sees as an inevitable part of the human condition. He analyses the impulses which drive us to fight one another and takes issue with the philosopher Hobbes' view that violence can be tamed principally by the use of reason. "The vast industrial style wars of the last century may have been left behind, but they have been followed by other forms of human conflict, in their way no less destructive". Producer: Sheila Cook.