It is just as important to acknowledge that a breach of existing orders occurred as to point out the foul results. Nobody in war comes out clean and noble. Bad shit happens amongst the good guys almost as often as among the bad guys. What is important is that the actions were not in accordance with existing regulations at the time. The various times our soldiers have stepped beyond the limits of our regulations, they are brought before military courts martial to answer for their actions. I'm saying that a system that develops blind or fanatic following, to me, is automatically suspect.
On the other hand, my wife and I get into the discussion all the time, supposing we were German citizens just trying to earn a living in Nazi times. The Nazi's guillotined more of their own citizens during WWII than the French did during the Terror (for those who haven't paid attention in history class this is what the bad years of the French Revolution of 1791-3 is called). My wife says, and it bears strong consideration, would she be willing to risk the health and welfare of her family during those times to save a few of her fellow citizens? It is easy to cast aspersions on the German population for their lack of attempts to stop the worst manifestations of National Socialism, but what if it was you and your family you were placing at risk. As many things, easy to say, not so easy to do.
It is my hope and prayer that this Japanese soldier was able to find some peace in his life before his death. That is probably the best we can hope for and withholding judgment is the least we can do. My apologies to him, his family, and his nation for any misplaced words I may have said on this forum.