The way I understand it, it's not about denying other people on the spectrum (of whatever functioning levels) a remedy for the negative aspects of their condition, but rather it's about opposition to the implication that autism is a 'disease'. The word 'cure' in that context is, in my opinion, misplaced and inappropriate.
I'm in favour of accomodations, therapy, and to limited and controlled extent even medication, to help anyone on the autistic spectrum cope and function. Heck, I myself have benefited from accomodations at home and in school during childhood, and would likely not have grown into the man I am now without them. But I don't think it's realistic to speak of a cure that could remove all symptoms of an ASD, or even most. I think the notion of a 'cure for autism' oversimplifies what autism is.
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clarity of thought before rashness of action