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Those that dropped the bombs are primarily accountable. That being said, they will tell you they were just following the orders of their generals. Those generals will tell you that they were just following orders of the president. The President will say he made decisions he thought were in the interest of National Security based off the intelligence from the CIA, FBI, NSA and frankly isn't the one that dropped the bombs so doesn't bear the greater weight of moral culpability.

Diving deep once again!