I think there may be something to what you're saying, but I don't really see it that way.
The DSM does not exist to confer identities. It exists as a framework for diagnoses and treatment. And these are different. There are a lot of identities that don't warrant treatment. If something's in the DSM, that's a way of saying "We should try to treat and cure this. We should try to make it go away." For people who might be on the very, very high-functioning edge of the autistic spectrum, one could argue -- and I think you are arguing -- they don't need to be "fixed." We, in our society, really do not need to be invading every Department of Mathematics,* at every university, and trying to train the people there to be politicians and salespeople and party animals.
Redefining the spectrum as strictly autistic takes the highest-functioning cohort out of the spectrum; it respects their right to J. be who they are.
I am aware that there's a whole community of people who have coalesced around the Aspie identity, and I do see where you're coming from. For people whose capacity for social connection is already fragile, removing the name for their identity from the discourse could be harmful. I get that. But I think categorizing it as warranting treatment is probably more harmful in the end.
And (I think you know this too), I am sure, sure, sure, sure, sure that the removal of Asperger's from the DSM did not cause Adam Lanza to "snap." He may be a tragic reminder that there's a higher incidence of schizophrenia among people on the spectrum. Or he may have been psychotic all along, and it J. echoed the characteristics of Asperger's. We'll never know.
Finally, I think people have been unnecessarily harsh on this thread. Kozmoma is groping for answers J. like everyone else. It's a legitimate question even if you don't agree with the premise.
* And yeah, I KNOW that most, the vast majority, of mathematicians do not have Asperger's/ASD. I was J. using it as an example of one profession around which Aspies coalesce.