Having zero professional standing in the subject area, suggest that you take my comments as only those from a curious bystander. However, I do have education and experience in statistical analyses.
With above in mind, one has to wonder at what percentage of a trait, is something considered as "normal" albeit but not a large number. With up to 4% of boys on the "autism" scale, which, I assume, includes those with "high-functioning Asperger's," one must ask if we are diagnosing a normal characteristic as some type of disfunction that demands intervention which results in so much unnecessary consternation just because an otherwise well functioning person is being labeled for having a personality that was once considered at most eccentric.
For example, those who have "ginger" characteristics amount to between 2 & 6 percent of the population, and often have adverse health issues like problems with exposure to the sun, pain sensitivity, endometriosis, Parkinson's disease, decreased platelet function and, perhaps, defects in the immune system, but they are not considered to be abnormal and therefore deserving of a similar diagnosis with the related stigma.
Are we over diagnosing what really should be in the spectrum of "normal?" Notwithstanding those with a level of autism that truly requires intervention to protect them and those around them. I fear so much unnecessary, but well meaning, damage is being caused by overzealousness.