Andrew: My only issue is simply determining what illnesses are insurmountable, a decision I really wouldn't trust anyone (myself included) to make for legislative purposes. Individual cases differ so heavily that you'd have an extremely hard time opening a medical book and going through it, saying "abort that" and "give that kid a chance."

From what little reading I've done (again, I'm certainly not arrogant enough to claim I'm qualified here), Down Syndrome also seems somewhat variable. Some children are moderately retarded, while others are actually very close to the normal range. Physical deformities also vary widely.

In the end, where do you draw the line, and how can you be sure the line won't be moved later by politicians with an agenda? The world complicates simple decisions... it's a frustrating issue.