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Just keep in mind that usefullness is subjective. What about blind people or disabled veterens? Should we kill them too? You're about as close as you can get to modern barbarism if you go down the path of eliminating those deemed unnecessary by society.
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Seen from an evolutionary point of view, that would be just the way to go about it. But the thing is, we killed evolution long time ago, when we had the ability to cure diseases and handicaps.