Autism is not a disease.
It is a human (and nature) cognitive variation. Autism Spectrum is just part of the diversity inherint in nature.
I tend toward the genetic angle of the origin of Autism. The expression and presence of Autism in my family goes back many generations.
Autism, in it's truest sense (as diagnosed and/or recognised in an individual) is a part of ones beingness, 'make-up', soul and is an indelible part of their lives, which cannot be removed. Quality assistance can help increase quality of life, when an aspect of one's Autism presentation is personally experienced as problematic.
Many persons living with Autism as part of their beingness would be insulted to be told or have it suggested that a unique part of their beingness was distasteful to another and that it should be 'removed', deleted from life - stopped or eliminated.
A person living with Autism as part of their lives is not a damaged, broken or diseased.
Diversity is to be embraced.
Sometimes, some individuals can display some autistic characteristics following a catastrophic event or reaction to another biological or cognitive event or onslaught. This should not be confused with a definitive diagnosis of Autism being an indelible part of one's natural being.