Can the crimes Japanese committed be justified?

Maybe some of you don't know how Chinese hate Japanese. Japan has committed unforgivable crimes in China back to late 1930s. The Nanjing Massacre is known to everyone. After eighty years, Japan still held hatred towards China. Just recently, Japan tried to annex Diaoyu Island, which was close to Japan and Taiwan. Diaoyu Island has a important military position: the seas around the island have rich oil resource underneath. But the Western powers have influenced Japan in many ways since the war. Can the crimes Japan committed be justified? Do you have sympathy towards Japan?