The bomb was, without doubt, in direct contravention of all international conventions and norms of war. Doubtless the Japanese were also capable of inflicting horror on civilian populations, but that does not excuse Truman. Not one iota. By his actions, Truman ushered in an age in which mass destruction not only became possible, but became casual - the flick of a switch would wipe out a city. He should never be forgiven for this.