[AbrahamParangi]

This is a material argument that is totally undercut by the fact that the bomb gave japan an excuse to surrender that they needed and otherwise would not have had. The bomb was directly referenced in Hirohito's surrender speech:

Moreover, the enemy has begun to employ a new and most cruel bomb, the power of which to do damage is, indeed, incalculable, taking the toll of many innocent lives. Should we continue to fight, not only would it result in an ultimate collapse and obliteration of the Japanese nation, but also it would lead to the total extinction of human civilization.

It gave them an excuse to save face.

[howbadisthat]

Correct. The incentives for individuals rarely align with the incentives of polities (and it can be argued those entities only exist in history books).

The bombs and their awesome power served to align the incentives of individuals in decision making positions with the incentives ascribed to the polity named Japan to issue surrender.