100% correct. The ADA has had the side effect of criminalizing anti-social behavior by disturbed kids, just as the severe mental illness is now criminalized thanks to analogous nightmare legislation.
It is really, really bad for a 6 year old to be charged. And no judge on earth (except in sharia law) will ever punish this autistic boy. But it may be the only leverage a school has to get rid of a violent kid and his parents from hell, to protect the normal kids and staff.
Normal parents of normal kids have no business putting their children in government schools, anyway. That is child-abuse on its face.