How many of those "innocent children" had practiced their gutting skills on the living bodies of US Service members?
Japan was putting weapons into the hands of those "innocent children" and telling them to kill for the Emperor.
Maybe this is a question you should be asking the parents of the cute little tots.
“How many of those “innocent children” had practiced their gutting skills on the living bodies of US Service members?”
None. Zero. Else they would not be innocent. And how does that answer the basic question? When is it moral to kill an innocent child?