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It definitely got me thinking. Similar to what you say, the human body is generally accepted as built for certain optimum performance -hearing ability being one such attribute. So could we say that, in the same vein as the feeling of these deaf people (they were from birth in the programme), someone calling discrimation on the screening of down syndromme would not have ground to stand on?
In relation to my other post just now on birth screening, the debate could then lead to how do we decide what the human body/mind is designed to have? Could we turn to anything that would be a disadvantage to a individual in an evolutionary sense as being a design flaw?