Honestly, I feel bad for everybody involved. What she is doing is horrible, but I am not ready to crucify her yet.
It sounds like she is at her wit's end. In the GMA link, she said that she had tried other methods like time out and it was a joke (her quote). That it didn't work. She does not do this to the other kids by the sounds of it (not that that makes it any better).
Have you ever seen or worked with a kid with attachment disorders? I know a kid with Reactive Attachment Disorder. (RAD). It is bad. The kid is the same age as the kid in the video and when the child flips out, the police have to be called the child is that violent. At 7. It is frightening. The parents in the case I know are doing everything to help the child, but it is a very slow road. The prognosis for RAD can be scary.
I am not saying this in any way to condone what she did. But until I know more about what is going on, I don't want to just dismiss her as a cruel woman. Remember the woman who returned her son? He had RAD I believe and if I remember correctly, she had tried to get help and nobody would help her. They were getting death threats from the kid and were scared of him. It makes me wonder if there is a similar circumstance.
I am glad that the courts are intervening. I think the whole family needs help. They either need to get them into counseling and teach her how to work with child with attachment disorders, or remove the little boy and put him in a home that is capable of raising a child with attachment disorders.