Who cares whether they were angry or not, during WW2 their soldiers were the most cruel, disgusting vile creatures on the planet.
At the fall of Singapore they beheaded enemy soldiers, burned prisoners alive, invaded hospital killing the patients where they lay in their beds plus the nurses and doctors, their Australian and British POW were worked and often bashed to death when they were forced to build the Burma-Thailand Railway, they say say one death for every sleeper laid.
I saw the result of their torture after the war when Australian POWs returned home, i had mates fathers who were POWs and saw the suffering and pain these men were still going through right up to their early deaths. this photo is of Special forces Sergeant Leonard Siffleet being beheaded after 2 weeks of torture, the executioner Yasono Chikao was tried after the war and sentenced to death but served only 10 years in prison before returning to Japan.

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When my generation go people will forget what happened but until then i will never forgive or forget.