The seppuku culture was an awful culture. No way around it or making excuses with "cultural relativism". From a philosophy of hedonism, which may not be the same as what you associate with the word, it does nothing to attain the greatest amount of pleasure or happiness for society as a whole.
Hedonism is not selfishness. It's a philosophy that states it's sensible for humans to strive for the greatest amount of pleasure or happiness . That is a group philosophy. As does seppuku culture violate many other sensible philosophies.
I'm obviously not talking down anyone here or acting like other cultures are superior to Japanese culture. I am very enthusiastic about Japanese culture and quite the Japanophile. I merely find it to be one of the sad and unfortunate cultural events in human history. The feudal days of Japan had much beauty indeed, but were quite dystopian.
Sure, you can take the moral relativist card to seppuku, but by that point you've reached a moral ground where slavery and genocide can just be argued to be cultural difference.
Anyway, I would like this aspect of group culture to lessen. I like tightly knit culture where doing what's best for everyone takes priority. I have a lot of sympathy for East Asian collectivism. And I wouldn't equate it with racism like a lot of people like to(I wouldn't blame the East or West particularly of racism, and I hate how people go to either extreme to describe the interaction of the East and the West, racists telling Asiaphiles that "Asia is more racist than the West because of group culture, and Westerners will never be allowed in" or "the West is a worldwide racism creator due to imperialism and blahblah" and have the audacity to say that Westerners in Asia have privilege. It's stupid. Group culture is nice, it doesn't mean the East or the West is superior, and it doesn't mean racism for a culture to be more collectivist. It doesn't mean Westerners are out and out excluded from ever being part of the "group". There's something very warm and harmonious about it when you think about it.
What is negative sometimes about the consequences though, is often too much feeling of shame in some individuals. And the feeling that you own your existence to others. You know something is wrong when a culture gets to the point where not committing suicide is selfish and committing suicide is humble, responsible, and respectable.
As much I also don't like it when some Westerners travel to Asian and automatically assume they can never be a part even remotely connected to the whole. Much like the common saying many trolls on the internet say, "you will never be Japanese". They mean to contrast the Asian whole to the Western whole. And tell someone they will never have a part in anything other than looking silly by taking part in activity they don't think is prescribed to their ethnicity. And therefor Westerners in Asia feel the need to be a "maverick", or condescendingly talk about how they believe they are not perceived as belonging. That sort of contrasting East and West also leads to exotification. And all sorts of other problems. Though I've noticed that people seem to be a lot more offended by exotification when it least to Eastern and Western interaction instead of separatism. Most people seem okay with exotification when it is followed by separatism. It's a bit disturbing. And psychologically gross and repulsing trend, if you ask me.