The national-social cocktail completely tore apart common decency.
[1] https://en.wikipedia.org/wiki/Monowitz_concentration_camp#Bu...
Really? Atrocities against civilians in war were common even then. No need to look further than e.g. the colonies.
I think the point was that scale of it was quite different in WW2. In WW2 the majority of casualties were civilians, which was new compared to previous conflicts.
I'd have to see data on that, not that I definitely disbelieve it. But it does seem to me that this was more often the case than not.
The Germans explicitely suspended its use in their armed forces for the Eastern Front – which is why millions of Soviet PoWs were left to die of starvation in what was basically large cattle pens while Jews or card-carrying Communists were to be shot on the spot after capture.