Japanese murder of the wounded was a pretty typical facet of the bitter fighting in the Pacific. Plenty of other examples abound. The Japanese captured an Australian soldier in New Guinea, tied him to a tree and used him for bayonet practice. They left him there with a note on his body that said “He took a long time to die.” American medics were a favorite target of the Japanese, so they learned quickly to go into combat without insignia, and armed. They more or less fought as infantry.
The stories of their fanatical and brutal resistance are becomming commonplace, and will eventually be accepted as a truism.
But revisionist left-wing historians would have us believe that two years from now they are “about to surrender.”
IIRC, some Japanese soldier even broke into the Imperial Palace to try to stop the Emperor from surrendering.