I have always wondered too, how a parent can "forget" the most precious person in their lives.
I have never, not once, ever, forgot any of my kids anywhere. Never did, never will.
I really don't see how this is done, how you forget your child.
I see both sides of this story, a women who could land in poverty, lose her home, her job, her income because the sitter is not reliable or does not show up. You are dependent on the sitter, she can control your job and income.
That would cause her to lose her child to the state and she would not be able to get him back without a home or job, and daycare.
A women who does not want to pay, or cannot afford to pay for child care.
A women who stays at home, and not work, lives off the state and is in poverty and has no prospects of work.
A women, who's sitter cancelled at the last minute, and the women faced with again losing her only source of income for support to herself and her child.
A women who may have done this before, who "made a huge" mistake.
If a person does something risky, the chances of a horrible terrible thing happening increases the more the risky behaviour is performed.
But in the end, the child died. I will not and do not lose that factual aspect of this case. The child died alone in a hot car, scared, terrified in pain, crying and died.
It is in the end is it the parents responsiblity for their children. A plan without a back-up is no plan. Some of my single parents friends, always have back up child care in place, just in case the primary sitter is not available.
Or they share the cost of a nanny......with again a back up in place.
I would always hire a Nanny under the condition that she may have to watch another child, and be VERY well compensated for it, so that she does not feel put out. But I had a back up in case too.