Helen Keller was not BORN blind and deaf, plus, those are not life-threatening disabilites that require life-support.
Who is Fanny Crosby?
Didn't she write several Baptist hymns?
Well, not specifically Baptist, although her hymns are loved and sang frequently in many Baptist churches.
http://en.wikipedia.org/wiki/Fanny_Crosby
And, no Fanny Crosby was not born blind either. My point in bringing up those two people, was merely that the disabled can be, and are, still valuable to society.
Go just as far as you feel comfortable down that slippery slope - I'm sure there's someone behind you waiting to give you a little nudge further...