网友Arolas Mao的回答
There are many good answers, but I still want to answer this question because I just received a request.
这里已经有很多好的答案，但我仍然想回答这个问题，因为我刚刚收到一个请求。
Historical reasons:
历史原因：
After World War II, Germany was like this:
二战后，德国是这样的：
All students must understand why and how we launched this war and committed war crimes. We have the responsibility to reflect on the Holocaust against Jews.
所有学生都必须了解我们为什么以及如何发动这场战争并犯下战争罪。我们有责任反思对犹太人的大屠杀。
Japan is like this:
日本是这样的：
We put war criminals in the shrine because that is our culture. Will our Prime Minister visit? It's no big deal. They just show respect to those who fight for the country. We are also victims of war: nuclear bombs do too much harm to us
我们把战犯放在神社里，因为那是我们的文化。我们的首相会去参观吗？没什么大不了的，他们只是对那些为国家而战的人表示尊重。我们也是战争的受害者：核弹对我们的伤害太大了…
Japanese right-wing group portrait:
日本右翼群像：
"Japan did nothing wrong. The Nanjing Massacre was forged by China."
“日本没有做错什么，南京大屠杀是中国伪造的。”
This is why some Chinese say that the Japanese never regret the war. It regrets that it was defeated. As far as I know, Germany did not massacre 300000 French in Paris. During the occupation of France, it did not conduct immoral human experiments on the French.