I don't think they'll EVER realize it. There is a systematic elimination of any discussion or writings about the events leading up to U.S. participation in WWII. One of the volunteers at the Planes of Fame is a Japanese citizen who lives near Nagoya. None of the workers in the factory near where he lived even knew that the building was used to build aircraft during WWII. His father had worked there during the war.
At the Planes of Fame, when we restored out D4Y-3 "Judy," this volunteer was surprised to find that the center fuel tank was signed by his father, who had done so in the same building where some of his acquaintances worked.
Apparently, nobody was taught much about WWII, the role of Japan in it, or the role of the U.S. in it. They knew of WWII and knew they had lost, but were never taught that they started open hostilities by bombing Pearl Harbor. From what he said, if you attacked Japan and said it was revenge for Pearl Harbor, almost nobody would know what you meant by that. They were ALSO not taught about U.S. embargos of raw materials going to Japan, which led to Pearl Harbor in the first place. Basically, they just don't seem to know a great deal about WWII or their role in it.
None of this reflects upon the people of Japan today, the way they think, or their ideology ... it is just a fact of life.
I don't much like the history textbooks I have seen in the U.S.A. They gloss over out civil war and hardly even speak about the root causes at all. I have history books written right after the civil war, and there was only one primary cause spoken of in all of them. But ... I would have no idea how to change what texts were selected for use in our school history classes. Likely, it is the same in Japan. Their national school system is what it is, and the average citizen likely has little opportunity to change it.
One way to practically eliminate a behavior or belief is to shun it nationwide, remove references to it, and not ever talk about it again. It doesn't stop history from repeating itself, but it DOES remove the behavior / belief from general life for some period of time.