in a certain % of the population. Not terribly different from homosexuality or transgenderism. It serves the species survival chances to produce a certain % of the population that exhibits these personality characteristics. Just as it does to have a certain % be "conservative" (i.e. strongly competition-driven) and a certain % be "liberal" (i.e. more cooperation-driven).
And when I say 'the population' I do not mean strictly in the 'human population'. I believe that if it were studied in earnest, it would be discovered there are 'autistic' individuals in the entire Great Ape family (which include hominids such as us of course), and quite possibly dating even much further back in the evolutionary chain. Could be we'd find there are "autistic" dolphins & whales too, if we could devise a proper test for it.
Ergo, I don't think it's an "evolutionary step-forward for humanity", because I believe the general phenomenon very likely pre-dates humanity altogether.
Which of course makes RFK Jr's stupid bullshit feel even MORE like stupid bullshit to me personally than it might to the average person 
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