What makes you think everyone with autism is N and T? My autism is more severe than most who are diagnosed as high-functioning, but I score very close to the divide between N/S and T/F and can come out on either side depending on my mood at the time I take the test. Always about as I as can be and also strongly J. So I come out as INTJ-T, INSJ-T, INFJ-T, or INSJ-T, depending on my mood.
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Yet in my new wildness and freedom I almost welcome the bitterness of alienage. For although nepenthe has calmed me, I know always that I am an outsider; a stranger in this century and among those who are still men.
-H. P. Lovecraft, "The Outsider"