It's a paradox in that it's nearly impossible to appreciate the value of neurodiversity until you build a close relationship with such a person.
My cousin Tony with Downs's would have most likely been aborted decades ago if a test were available. What no one knew is that he would become so kind, good natured, and socialable it would bring incredible joy and love to literally hundreds of family members and friends. There won't be too many like him from now on: http://www.telegraph.co.uk/news/2016/03/22/downs-syndrome-pe...
The paradox is that most families with Autistic or Down's children would tell you their lives have been greatly enriched. To outsiders it sounds like parents are in denial and blinded to their child's predicament. But it's not denial or sympathy, the value is beautiful, but invisible until you experience it.