The real danger is that Japan does not acknowledge the wrongs they inflict on so many Asian countries. Even denying many atrocities they committed across Asia. Their evil military elites of that era are still honoured as heroes.
In Germany all elementary school students are taught the horrors of the Holocaust, and inculcated with the creed that a genocide must never again happen under German auspices.
The Japanese have never established any school program educating their children about the WWII atrocities committed by their forebears. Rather, millions still pay respects to their war heroes at Yasukuni Shrine annually. To date, the government has not offered any formal apology to any Asian country, nor made reparations. All their official 'apologies' are merely statements expressing 'regret' if you actually understand the nuance of the Japanese wording used.