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Its not about men and women, the same can be applied to both for the same reasons, society inevitably protects the weak. Many people with various deficiencies would die off if the current population were thrust into the same environment our ancestors inhabited.
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We would have to verify the assumption that war kills unfit men, and the men left are fit (fitness in a natural selection context). Because of the complexity and randomness of war I highly doubt this is true.
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Death in modern warfare seems so random I'm not sure it would select for the types of fitness usually considered attractive. Artillery fire doesn't discriminate between those who are tall / fit / muscular / courageous / intelligent and those who are not.
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