[Polybius]

The invasion of Japan was cancelled, and countless American lives were saved.

And an ever greater number of Japanese lives were also saved.

The Battle of Okinawa resulted in an estimated 50,000–150,000 Japanese and Okinawan civilian deaths and 100,000–125,000 Japanese military deaths and Okinawa was a small Japanese home island. Extrapolate those numbers to every other Japanese home island, both large and small, and the numbers stagger the mind.

[Crucis Country]

The surrender of Germany was unconditional. The surrender of the Japanese wasn't. The Japanese demanded conditions and got them. One was retention of the Emperor, another was that the Emperor would not be held for warcrimes.