Many nations have something very unsavoury in their national history and within each of those there is an element who find it impossible to face up to and instead seek to wish it away, often as not by denial or at least adjusting some aspect(s). As so often, it is a matter of percentages - sometimes only a very few individuals, sometimes enough to be visible. Those who already knew/know may need to be persuaded to take facts on board. There is a realistic balance to be struck, those not even born at the time are entirely innocent but they need to know rather than things being hidden - how to present the history to best effect ?
The victors aren't burdened by their atrocities and often/invariably bury them. Some call themselves "Great", "World's Best", etc. and continue the conflict by incessantly celebrating (anniversaries), reminding (the enemy were so bad), wallowing (our poor heroes), etc. The conflict is relentlessly promoted ad nauseam so nobody can fail to know what is expected: posturing sympathy with the old/continuing/new cause. Certain parts of history are meant to remain so they can be clung to.
We had a visit yesterday from a 30 year old Japanese. I asked how Japanese people see WW2 these days. She said everyone is taught about the war at history classes in school. She was born 45 years after the war ended and I was not surprised that she did not appear to feel any of that period belonged to her. The impression I got was that she saw that period as one when rather deranged people ran her country. I did not press because I also felt she did not want me to. We have other Japanese friends more than twice her age, they also give no indication of wanting to personally own any part of the past. All three are inclined to criticise certain aspects of current Japanese politics, leadership, etc., just like people do elsewhere.
Yes, the notion of superiority was a feature of national self-promotion both in Germany and Japan during WW2, but how far do we have to go in the search for that sort of notion in today's world, excluding whether it is a feature of official international policy ? My suspicion is that if you could, with each individual, trace the source of such sentiments it is to be found in the previous generation. The vanquished teach their descendants to see war as a mistake/failure. The victors hang onto the "glory" and teach their descendants to lap it up and regurgitate it at every occasion/opportunity. Is that justifiable ?