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Soldiers must emotionally distance from the designated enemy, must hate whom they are told to hate, and so some soldiers develop insulting vocabulary to describe the opposition. Objectification makes it less difficult to kill another.
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Footnote:
It has been said by veterans for peace groups that poor men die in rich men's wars.
CSpan aired a Vietnam era author on Nov 20, 2018 who said
'Generals get medals. Soldiers get buried.' (paraphrased)
saiom shriver