What is a war?

To begin with, the war is massacring all enemy include all enemy’s citizen, isn’t it? I believe it since I was a child because U.S. had killed all Japanese not only by the nuclear bomb but also the great Tokyo air raid so on at WWII.

I have a question. When did it determine, serviceman can’t kill enemy’s people? Even if this rule was decided after WWII, Japanese soldier killing Chinese and Korean by the war was not guilt. I don’t know why Japanese is criticized by China and Korea?

They always request Japan to apologize China and Korea, for what does Japan apologize to them? Their request is unnatural logically.

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