If all autistic children who were born were anesthetized and euthanized, the world would be better.
People with autism cause strain to their parents through the difficult steps of raising an autistic child. People with autism cause strains socially because of their inability to appear and act absolutely completely normal, which resigns them to the uncanny valley of social perception. Autism may bring an occasional child with savant characteristics, but the vast majority of people with autism will never build a career. The challenges that autism brings will not allow the majority of autistic adults to succeed at more than being worker drone in a factory or similar employment requirements.
My train of thought was spurred my Nietzsche. Something like 'we are not born human, we live to become human'. A baby has no value to society. It only has potential. Autistic children have much less potential for success and much higher potential for avoidable stress on parents, schools, and society.
Just because a parent develops an unavoidable bond with a child doesn't mean that the child should be saved if they are destined to cause issues a difficulties. Old cultures knew the advantages of favoring babies that were absolutely 100% healthy. Just because we CAN save and care for all children, doesn't mean it will contribute positively to a progressive society.