Blind or deaf people would probably feel pretty bad hearing "you don't want a blind or deaf kid".
Try explaining to your son or daughter that they could've been able to see and hear, but you refused to avoid hurting the feelings of existing blind and deaf people...
more like try explaining to your son or daughter that they wouldn't have been born at all
I am legally blind. I would not want my children to have any disability whatsoever because it's difficult and miserable.