With regard to ASD persisting under natural selection, I would have thought it is obvious that natural selection is a slow process, and somewhat imperfect. We really do not know if the numbers of Autistic's is on the rise or the decline. On the face of it it would appear that ASD is on the rise, but this is only measured by the increased number of diagnosed. This is not an indicator that actual incidence is on the rise it just means that our metal health systems have caught up with the issue.
Humanity also has, in a way, screwed with natural selection. Unlike many animals we do not have a dominant male who has a harem of females attracted to his prowess, and unlike other animals who mate for life we have cultural and political, issues getting in the way of true natural selection. Then of course I do not know of any other species who send all the males off to tear each other to shreds in massive conflagrations, again leaving less choice for natural selection.
_________________
"I'd take the awe of understanding over the awe of ignorance anyday"
Douglas Adams
"Religion is the impotence of the human mind to deal with occurrences it cannot understand" Karl Marx