> You can’t purge a cultural heritage—everyone in Japan learns Japanese history and ritual suicide is a notable part of that history.
Not sure where you get this idea, but this is grossly inaccurate.
Japanese culture is strongly revisionist. People don't talk about the war, much less teach about it. The 'old ways' and 'samurai heroism' was faulted for the mess in '40s. People make a sigh whenever such touchy topics come up. New Japan is a different beast.
As a consequence, we are seeing a generation which is severely confused on why WW2 happened. American pop culture is embraced with open arms, but they can't explain why Hiroshima happened at the hands of US. It's all faulted to grave mistakes on the 'old thinking' which is best left behind. Japan adopted modernism & became America's best buddies, ignoring the blemishes over 3 decades of Imperial japanese horrors. Older generation, who used to teach from experience of pre-war and neo-modern Japan, are dying off due to age. A significant chapter of history is being ignored by looking the other way. Look up the editorials of any Japanese weekly, and on any random week you will find some discussion on how they bemoan the growing dissonance between the post-war values of peace & the cultural change alongside the pseudo-aggression of some political parties, which eventually aims to remilitarize Japan at some point. (That's a story for another time or another thread)