Maybe you should check out what's happening today and not 50 years ago
But you see what the Japanese officials are doing today. They are still worshipping war criminals in the Yasukuni shrine. They are still denying history facts (see below). They are building an army which is beyond self defence. They can even build atomic bombs in a day or two because they store those materials in the nuclear plants.
In May 1994, Justice Minister Shigeto Nagano called the Nanjing Massacre a "fabrication".
On June 19, 2007, a group of around 100 Liberal Democratic Party (LDP) lawmakers again denounced the Nanjing Massacre as a fabrication, arguing that there was no evidence to prove the allegations of mass killings by Japanese soldiers. They accused Beijing of using the alleged incident as a "political advertisement".
On February 20, 2012, Takashi Kawamura, mayor of Nagoya, told a visiting delegation from Nanjing that the massacre "probably never happened". Two days later he defended his remarks, saying, "Even since I was a national Diet representative, I have said [repeatedly] there was no [Nanjing] massacre that resulted in murders of several hundred thousands of people."
On February 24, 2012, Tokyo governor Shintaro Ishihara said that he also believes that the Nanjing massacre never happened. He reportedly claims it would have been impossible to kill so many people in such a short period of time.
Check these out, they are all on the internet.
And this islands dispute was created by the U.S anyway.