> Had the author made that distinction it would've been helpful, or had they perhaps instead used some of the Japanese or Soviet forces as an example it would've been better.

But even for these forces, I think the claim that they are all to be regarded as evil goes too far. Were there individual evil Japanese, Soviet, and German soldiers? To be sure—but there were also evil American ones. More importantly, does serving an evil government make you evil? Since 'evil' is determined, as history is written, by the winners, this would seem to amount to the claim that being honourable largely amounts to picking the winning side in advance. (I think positing instead an absolute definition of 'evil', as a disagree-r may be tempted initially to do, is probably untenable.)