Maybe the Hagakure observations were correct and afterwards morality improved only to decline again in the 20th century. Or maybe his observations are irrelevant to a 20th century phenomenon.
I think it is normal for younger generations to try to differenciate themselves from the older ones. This differenciation necessarily puts the older generation into a situation where they have to question themselves or — the easier route — you don't do that and go all Seymour Skinner: "Am I so out of touch? No, it's the children who are wrong" and call it a day.
Morals are a fluid thing. My Wehrmacht-serving grandfather for example would say talking about one's feelings is weak and therefore morally wrong and this was a common view in his generation. I would say talking about one's feeling is hard and not talking about them is a sign of a weak person. He fucked up his whole family by insisting to look strong, my father was strong by breaking with the morals of his father.
Morals are a fluid thing. My Wehrmacht-serving grandfather for example would say talking about one's feelings is weak and therefore morally wrong and this was a common view in his generation. I would say talking about one's feeling is hard and not talking about them is a sign of a weak person. He fucked up his whole family by insisting to look strong, my father was strong by breaking with the morals of his father.