When the Kwantung Army officially surrendered on August 20th, the Soviets had already occupied and forced the surrender of most the Kwantung Army.
Huh, no. The order of surrender had been issued on August 16th. And guess what, the official surrender is dated August 20th because many Japanese units either did not receive the order or ignored it and continued fighting. And no, the Soviets had not "forced the surrender" of most of the Army; they had simply bypassed, in many instances, strongholds that had refused to surrender. That made those pockets ineffective and doomed, but not "surrendered".
The conduct of many individual American soldiers was not exactly fringe knowledge - it was criticized by FDR himself.
Yeah. This is not relevant, since I never claimed that it was "fringe knowledge".