1, Japan agreed to surrender only when the United States agreed to leave the Emperor alone, and promised to have a democracy (note that arguably Japan was a constitutional monarchy to begin with, as the elected leaders were calling the shots, and they held a free election during the war with anti-war candidates allowed to run).
2. Had the July 1944 conspiracy worked, and it came close, Hitler would have been dead (meanings his “agreement” to anything would not be an issue, the leadership of Germany would be in prison or dead, and the generals led by Rommel would have been in charge and their plan would have included ending the Holocaust and arresting the Gestapo, and suing for peace). While I tend to think the world was better off with the way it did work out, around a million Jews died during those find 10 months.