To even suggest that there may be a possible makes me hope and pray that you never are blessed with a child.
Read my post, I have a child. I would never do this to him.
I also wouldn't let the stupid doctors and schools convince me to sedate my child with RITALIN, but there are people that do. I consider them the same as you are considering me, just because I recognize that people do strange things for strange reasons, and the answer why is not always obvious. I can't think of why a rational sane person would tie a child to the bed, and I would like to know what their's was.
I can't think of rational reasons to kill a complete stranger, but people do it every day, and do it legally, as well.
I know this is a stretch, but maybe the parents aren't the ones that locked her to the bed. Did you think of that? That is why I want to have the evidence before I jump to conclusions.