Like I said before, the real crime would have been her influence on the child. It wouldn't be surprising if she were selling nude photos of this child 10 years henceforth, if she wasn't dead.
The real crime was her murder and that her murderer got away with it.
Bonnie had a lot of other children and she never put their photos on the net, so your arguement that she had to be killed to save the daughter doesn't hold water.
All he had to do was divorce her and ask for custody instead killing her.