How can you study history and even ask a question like this seriously? It's a well known and widely documented feature of Japanese (and some other Asian countries') culture.
I don't have the book with me to quote, but in Chinese Culture: A Sourcebook, there's a section talking about an ancient Chinese general's response to a suggestion that they build a war monument after a decisive victory, so I'll paraphrase the gist of what he said. Essentially, the general said they should not build a monument celebrating the victory, because the general said the fact that they needed to go into battle in the first place was a result of a failure on the part of the government-- had they done their jobs correctly, there would've been no need for a battle in the first place-- and so why should they waste resources building a monument to what amounts to failure? I don't recall the year that this took place, but it was at least 1,000 years ago, and there are further examples all across history in both Chinese and Japanese cultures.
If you study psychology, you'll find a similar, related effect of this difference in their societies. The incidence of clinical psychopathy in the U.S. and other Westernized countries is somewhere on the order of 1 in 25, to 1 in 100 people. When the exact same criteria are applied in some Asian countries, the results show that the incidence of psychopathy is somewhere on the order of 1 in 100 to 1 in 400. There has not been adequate research to confirm the hypothesis, but the researchers believe that the actual incidence is not higher in those Asian countries, and it's simply that due to their cultures being more "everyone-oriented" rather than individual-oriented as we have here in the U.S., that the psychopaths have simply had to adapt to considering other people in order to succeed and pursue their own goals-- so they're just less visible and marginally less anti-social due to the necessity of being pro-social in order to succeed at anything or to have any power to wield over anyone.
Literally all of the facts suggest that the differences that show up across the board in their culture and history are why they take different approaches to things than we do here in the west-- approaches in which the leaders are more likely to take personal responsibility, or at least handle things personally enough that there are direct repercussions to them for their own failures. For modern examples, look at the executives being prosecuted for their handling of the Fukushima Daiichi power plant after the tsunami, or the fact that when it came time to clean up after the disaster, it was the older workers to volunteered to do it because they were nearer to the end of their lives anyway, so that the younger people who had more life left to live would be more likely to be able to live them out.
Their history is riddled with examples like that. Remember that this is a nation that came up with seppuku as a means to deal with ultimate failure or even bringing shame onto oneself or one's family through one's failure.