Couple of points here.
1. The Japanese and the Chinese were at war long before the Doolittle raid. The Japanese had already attacked the Chinese without provocation. The Japanese were already in the process of targeting and killing Chinese including civilians by the thousands before Pearl Harbor.
2. The Doolittle raid was a military operation undertaken in a time of war by a military force against a beligerant nation. Please note that this was AFTER a declaration of war and AFTER an attack by the Japanese PRIOR to a declaration of war by the Japanese. The fact that they couldn't translate it and deliver it in time is moot, that was their own fault. The targets selected were of military value. They COULD have attacked the Emperor had they wished as he wore the uniform of his countries military and the palace location was known.
The US was not responsible for the war crimes committed by the Japanese before or after the raid. The responsible nation was in fact the Japanese. Any attempt to blame the deaths of citizens of a beligerant nation at the hands of another beligerant nation as a result of another combatant nations attack during a time of war is plane idiocy.
The US was in fact unaware that the Japanese did not have plans for an attack against the mainland. The thought was that one was imminent and there was no Naval power in position to stop an attack after Pearl. An actual invasion was not really feasable as the Japanese didn't have the strength to make it plausable. They neglected to inform the US about that at the time.
As to the redistributiuon of Japanese forces by the raid. It would be only common sense that having demonstrated the US could hit the Japanese homeland once they wold do so again. Leaving the homeland open to attack without a creditable defense would be rather idiotic. The Japanese did move air assets back to the homeland for this purpose as well as naval ships on coastal patrol. Don't believe it, look it up, it's simple history and has already been broadcast.
