Your quotes are from the US government, my claims are paraphrasing things i learned via Japanese media while in Japan. the truth is probably somewhere in between.
Japan would have been willing to surrender, if the terms allowed for the emperor to remain in power. This was actually in the original surrender draft, but Truman wanted to drop the bombs so he removed the provision at the last minute.
In the end we dropped the bombs and then let the emperor stay in power anyway.
and american media and text books are not? i think people are just uncomfortable with the possibility that the bombings may not have been justified