It is hardly surprising that most want a cure, or think they do. Few people really understand autism all that well, and what they do know of it makes it appear to be significantly debilitating and seriously limiting.
When you add to that, the weight of campaigning done over the years, the bulk of which has historically been on finding a cure or therapeutic strategies for remediating the impacts - and behaviors - that define autism for the majority, and clearly the sense is that a cure would be a desirable thing.
In reality, society doesn't listen to us at the best of times, so our voice from the inside, that we (meaning many, though not all of us) don't want a cure, and indeed that what we want all that money to be spent on is support, outreach, training instead, has largely been ignored.
One has to hope that is changing, and in Europe it seems to be to some degree. In the US, not so much.