My son has fragile X syndrome, which is absolutely genetic. He also has a diagnosis of autism which is directly due to the fragile X. The article deals mostly with regular autism, which usually does not have with it the mental retardation that my son has.
It is true that these disabilities have an incredible impact on families. Rain Man with Dustin Hoffman was a good exploration of autism. We've watched it twice with my daughter to give her some perspective on her brother's disability.