[SuziQ]

But others feel that children should be given every possible chance and view that selecting an embryo without a terminal genetic defect is morally equivalent to giving a sick child a life saving medicine.

Not quite, because they're not giving those other embryos, their own kids, a chance at life because they can't be assured that their lives may not be the best they can have. Who can ever be assured of that?

[jas3]

But others feel that children should be given every possible chance and view that selecting an embryo without a terminal genetic defect is morally equivalent to giving a sick child a life saving medicine.

Not quite, because they're not giving those other embryos, their own kids, a chance at life because they can't be assured that their lives may not be the best they can have. Who can ever be assured of that?

Nobody can ever be assured that their children's lives may not be the best they can be. However one can be reasonably certain that a child's life will be better without a terminal genetic disease than with that same disease.

And the issue is that the parents do not view a ball of 7 cells as "their own kids". I think that is a reasonable view. I can understand why one might think that a child is morally different from a ball of 7 undifferentiated cells. And I can see why some people might think those 7 cells are not morally different than discarding unused sperm.

jas3