If I'm understanding your question correctly, you would like to know if it's "in the best interest of a family not to accept their child with ASD." It depends upon what society we want to live in.
If we would like to live in a society founded upon integrity, honesty, and altruism, then yes, I would say that acceptance and cultivation of the autistic community is absolutely necessary, for they, more than any other group of people, are capable of embodying these ideals as far as I'm concerned.
Otherwise, if we would like to live in a society founded upon greed, avarice, and self-gratification, then the exact opposite group of people, psychopaths, should receive these things instead.
From what I've seen of society so far (especially recently in the U.S.), the latter is being fulfilled, while the former is being neglected.
I'd also like to add that I've always been pretty well-accepted by my family (probably because most of them don't know that I'm autistic), but not so much by others outside of my family. The only reason I think I've ever had a girlfriend is because she thought she was autistic too (although she was never diagnosed as a child), and so she was a lot more understanding and accepting of it. Most of my friends have been rather weird/nerdy/eccentric like me, although I don't think any of them were necessarily autistic (except for one in college who was "sort of" diagnosed as a kid). But because of what I've been reading and hearing about lately in journal articles and in the news more than my own personal experience, I feel very unaccepted by people in spite of the fact that most people I know personally accept me for who I am.
I don't know, maybe I'm just paranoid about what people think about me...
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"Works of art make rules; rules do not make works of art."
-- Claude Debussy