For whom? The children who might be in the same class with an autistic child? Or the autistic child himself?
Some autistic children can be educated at home, but others cannot be. If you read Temple Grandin's autobiography, she mentions her partial "homeschooling," but it was *not* what we think of as conventional homeschooling today. Her mother spent enormous amounts of money on tutors and aides to be with her at home. She got 8-10 hours a *day* of intense one-on-one interaction that for whatever reason her mother was not able to provide. As a high-functioning autistic, she did manage to eventually become an agricultural engineer, but being left alone at home with someone unable to cope with her particular situation would not have helped her.
Other children, if left at home, would basically retreat into their own self-stimulating world. Sometimes homeschooling is presented as a panacea for everything, but there are some situations where a special school and environment are indeed necessary.
She doesn't WANT to homeschool the child; she wants all the rest of us, the residents of the "village," to take care of her child.
So she leaves him in the school, which is required BY LAW (mostly by judicial fiat, as it happens) to put him in the "least restrictive environment--and d*mn the teachers or the other students.
Instead of the standard, pat, one-size-fits-all simplistic answers, you need to understand the real situation here.