I agree that to nuke Japan twice was too much. But you have to consider the the state of affairs and the mindset at the time. Nobody knew the real horrors of nukes and they were so pissed off and worn out that they were numb to such things anyway. They were warned and given time between the two bombings to respond. What would Japan have done if they had the oppertunity to use nukes on US cities?

Hindsight is always 20/20.

Watch the documentary "Fog of War" by Robert McNamara.