I understand that you are attempting to make a subtle point of culture and definition. However it's totally misguided in this case in both subject matter and historical reality. You urgently need to read more about the eastern front and the genocide.
The idea that barbarism refers only to a particular "style" of cruelty, horror and brutality is a dead end argument in this context, and hints at a coldness and lack of humanity that you need to look into.
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