This question opens a can of worms which has been debated many times before-- is Asperger's a bad thing? Is it a disability? Should it be called one?
All of these are different questions. I think the natural tendency is to assume that they're the same question and should all have the same answer. But they're not.
There's an idea called the social model of disability, which basically says that disability is functioning in the wrong way for your environment, and is an interaction rather than something inherent to the individual. Sort of like how someone in a wheelchair is less disabled here than they would be someplace with more staircases, but more disabled than they would be in a society which attached no stigma to using a wheelchair and made sure to make everywhere wheelchair-accessible.
Disability might even be a trait that would be a positive somewhere else. Dwarves have problems... here. In a society built for dwarves, you'd be bumping your head on ceilings all the time and probably eventually getting concussions, which would be seen as, oh, people with Excessive Height Syndrome are also more prone to concussions; how terrible it is that they're so malformed.
So... yes, many people on the spectrum have a disability here and now. In another world, NTs could be the disabled ones, but in this world, they're not.
Which doesn't actually answer the question of whether Asperger's is a bad thing. All it is, by itself, is a specific brain wiring; it's not even a "difference" unless you compare it to something it can be different from. Comparing it in the abstract to NT wiring without taking into account environment, it is just a difference. In some environments, an Aspie will suffer where an NT would not; in other environments, an NT will suffer where an Aspie would not. This society was build by and for NTs, to minimize their suffering, without a thought for someone whose needs are different. Hence, there are many more of the former type of environment than the latter.
There's another way to look at whether it's a bad thing or not, and that is what it can do for society at large. Aspies certainly bring things to the table which NTs do not. We do not bring any less to the table inherently, but years of suffering and ostracism experienced while NTs are learning valuable things we're never taught mean that we often bring less to the table in reality. We also sometimes bring more. But that is generally just a tool; look at what Einstein did. Good? Bad? I don't presume to say. Aspies can benefit the world for the better, or bring evils upon the world. The only thing that's certain is that they have a different potential to do so from NTs. They may achieve the same results. In some instances, they may even go about it the same way. But generally speaking, we do things differently. Not better (but it can lead to results NTs could never achieve). Not worse (but totally untrained and with self-confidence beaten out, versus NTs who've been taught from the beginning how to succeed...).
In this world, it may even be that we are more valuable because there are fewer replacements available-- if for whatever reason, I needed to round up as many NTs as possible, I know where to find more than I can count on both hands, and that's just on my block. If the same applied to Aspies, I'd have myself and my dad, and then I'd have to track down a married couple who probably live nowhere nearby, and one more person if you count HFA, and then I'd have to leave the city to find two more who might not even be Aspies, one six hours away. Then there's someone halfway across the country from me who might not even be an Aspie, and then I'd have to start tracking down WP members. Clearly, if you need what only an NT can give, it will be easier to acquire than if you need what only an Aspie can give.
Which to my way of thinking is itself sufficient answer, besides the other satisfactory answers, to the question of whether we should exist.
But then what to call it. "Disorder" gets services. "Difference" doesn't. In this society, where disability is viewed as something inherent to the individual or nonexistent, we pick the alternative that gets us free stuff.
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I'm using a non-verbal right now. I wish you could see it. --dyingofpoetry
NOT A DOCTOR