Why do families/friends grieve when soldiers/sailors die in wars over the years (Revolutionary War, 1812, Civil War, World Wars, Vietnam, Ukraine)?

People come and go, do they not?

Shouldn't money and bank accounts be the #1 priority as opposed to some casualty of war?

Why do families/friends grieve when soldiers/sailors die in wars over the years (Revolutionary War, 1812, Civil War, World Wars, Vietnam, Ukraine)?
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