I am not really sure if you mean that the Koreans can afford to lose more people than the US can or just that they are willing to sacrifice more people or what. Do you mean that there are some people who are more important to the war effort than others?
He's saying that regardless of their importance, some people are more valued than others.
In terms of casualties, any rational assessment of harm caused by a conflict will conclude that 1 dead person = 1 dead person.
No matter how rational that equation seems, it is never the formula used in a conflict.
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
I would say here something that was heard from an ecclesiastic of the most eminent degree; ‘That the intention of the Holy Ghost is to teach us how one goes to heaven, not how the heaven goes.’ Galileo Galilei 1615.
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass