It is true that not all idioms translate, although obviously many do.
A close one in English to the Argentinian idiom is: to the victors go the
spoils.
The difference it that the victor may have faced danger as well.
The term
fat cat refers to a person who profits from others' toil and
trouble. So you may hear something like: we lost our sons and daughters to the war
while that
fat cat CEO of (fill in the blank) made millions in profit at our expense.