Japan is not a person. No people should be held responsible in its entirety for a mistake of the political organisation governing them. Even in most democracies, minorities get to decide on cases concerning the people in its entirety, and during the WWII, an absolute monarchy with religious powers was in effect in Japan.
My parents were not yet born and my grandparents were grade school children when the US interned Japanese-Americans but their tax money was still used to compensate those people for the injustice done to them.
You inherit everything, good and bad, from those who came before you. It's your choice of what to keep and what to drop.
