Right is right and wrong is wrong.

My family and I were discussing the Autism Speaks video. They have not seen it, but I plan to make sure they do as soon as our internet connection is fast enough to stream it. (I hate speed limiting.)
I told them that some of the things that are done to the children on the video (I was thinking of the way some of them were wrenched around by their arms, this has to hurt) and that some of the ways autistic people have been treated in the past would be called child abuse if they were done to normal children. His response was that while he did not agree with their actions, the stress of raising an autistic child made it more understandable.

Stress is stressful. However, it is NO EXCUSE for taking things out on a child who cannot help being who they are. Should we expect our lives to be free from stress? Should we expect our lives to be perfect, free from disappointment and unhappiness? No, and no. Should we be allowed to use our own suffering as an excuse for inflicting suffering on others? Of course we should, because this is the best way to fix everything that is wrong in the world. Once we are all miserable, things will be great!
I am not saying that we should completely ignore the circumstances that surround people's actions. Life does not happen in a vacuum. However, some things are clearly wrong. It is wrong to harm a child because they won't do what you want right away and are not harming anyone.
It is wrong to talk about wanting to kill your child when they are in the room with you.
It is wrong and stupid to complain about your child not interacting then completely ignore their obvious attempts to interact with you.
It is heartbreaking that anyone would thinking that parroting "I love you Mummy" in a robotic voice is a better/more appropriate way of showing love than the attempts these children were making to reach their parents.
IT IS WRONG to take your own suffering out on ANYONE, LET ALONE A CHILD.

Stress can be awful. I know this, because I experience enough stress daily to have an anxiety disorder. I am not perfect, I snap at my family, withdraw from friends, throw things at my brothers (who are perfectly able to defend themselves, one is 14 1/2 and the other is almost 17 and stands head and shoulders above me). I may be seriously tempted at times to go and kill large numbers of people, but I do not do so, because, for the most part, my stress is not their fault. I do not kick the cat or the dog, because it is not their fault, and I have a responsibility for their safety.
Wrong is wrong.