re: Dawkins: "immoral to bring [Down's Syndrome baby] into the world"

quote:

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The question is not ‘is it human’?’ but ‘can it suffer?'

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Maybe I'm confused by the intent of this question, but I read this to mean he believes it to be more humane to abort the down's baby because of all the suffering the baby will face in his/her lifetime. The short-term suffering of aborting the baby is small in comparison to this hypothetical situation we all automatically assume will come to fruition.

To that end I ask: Are there people on this earth who can't suffer? Wouldn't this threshold make the murder of anyone acceptable because we will all almost certainly suffer greater ills by the time our lives are over?