I think what dreadsox is saying is not that he's against medical advancements or early diagnosis of problems but only that in the case of babies it could lead to a Hitler-ish mentality of selective abortion to achieve 'perfect' babies, and that is a grim and chilling thought. Is this only in extreme cases of hideous deformality or life threatening problems, or do we get picky, the cleft palate, next maybe the nose is too big, the eyes are going to be the wrong color, wrong sex. Will there come a time when people can read the genetic code of the fetus, even get a computer printout of what it will look like, and have parents look at it and decide if it's worthy of giving a life, or their love?
That is very frightening to me, like a bad futuristic movie. I am not one to be able to leave things to people's consciences because some people don't have one and some can rationalize away quite a bit if they don't feel like living with guilt. That's why there are laws and rules against certain things in this world.