Face it, japan didn't capitulate because of the atomic bombs

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Face it, japan didn't capitulate because of the atomic bombs but rather because of the soviet invasion of manchuria.
Prior to the atomic bombings, us air raids had already destroyed over 60 japanese cities with conventional bombing. It isn't really important that the americans used atomic bombs, since they could have used firebombs to the same effect.
Towards the end of the war, the japanese high command knew that they had no way of winning, but they were still confident that they could have a peace treaty with the allies that would leave their empire somewhat intact, rather than the complete capitulation that happened in real life.
They believed in this for two reasons:
1. They still held manchuria, korea and large swathes of china. They thought that they could use resources from these lands to fuel the war.
2. They thought that they could have a favourable peace treaty through the soviet union, who had considerable infulence over the united states and who did not want to see united states expand their reach in asia.

With the soviet declaration of war and the following invasion, the japanese saw that they had no way of preserving their empire, and thus capitulated.