A woman who was a schoolgirl at Hiroshima asked, “Those scientists who invented the atomic bomb, what did they think would happen if they dropped it?

Above all, the sense of personal responsibility was reduced by the way agency was fragmented. Among the airmen who obeyed the order to drop the bomb, the many scientists who helped to make it, the President, the many political and military advisers involved in the decision, who killed the people of Hiroshima? No one seems to have felt that the responsibility was fully his.

o In the decision to use the bomb the base line had shifted down during the moral slide from the blockade to the area bombing of Germany and to the fire-bombing of Japan. Predictably one member of Stimson’s committee made the point that the ‘number of people that would be killed by the bomb would not be greater in general magnitude than the number already killed in fire raids’.

Those who actually dropped the bombs were less responsible than the people who took the decisions higher up the chain of command. In modern technological war, psychological responses are poorly correlated with degrees of responsibility. In people further back up the chain, this casual distance reduces the psychological resistance they have to overcome.

A phased decision can avoid there being a key moment when the moral issue about killing civilians has to be confronted.

The use of the blockade against Germany to starve large numbers of people to death broke through the moral barrier against the mass killing of civilians. It was the precedent for the 'conventional' bombing of civilians in the Second World War and then for the use of the atomic bomb.

The hardest - the part that's hard is to kill, but once you kill, that becomes easier, to kill the next person and the next one and the next one." -Varnado Simpson, Charlie Company of My Lai