People in Britain are shocked — shocked! — that medical doctors are suspected of involvement in the al Qaeda terrorist attacks on Britain over the past few days. The shock reflects the deep unreality of public discourse up till now. People have persisted in believing that Islamic terrorism could be explained by poverty, deprivation, alienation and so forth, despite all the evidence to the contrary. Now they are horrified that doctors, whose calling is to save life, can be bent on mass murder.

The capacity of the human mind to delude itself never ceases to amaze. How can such educated individuals be killers? people exclaim. Have such people really leaned nothing from history? Have they forgotten the Nazis, forgotten Dr Mengele, forgotten that the genocide of the Jews was carried out by people who delighted in Goethe and Mozart? Ayman al Zawahiri, bin Laden’s number two, is a paediatrician. Yet he is responsible for the deliberate mass murder of thousands of people.