Excellent point. People should realize that this type of thing DOES happen. It is not neglect, nor is it a lack of love for the child. Rather, it is an oversight and happens when both parents don't completely communicate and believe the other one has responsibility for a child. Thankfully this did not have tragic consequences.
This type of situation is different from those "parents" who intentionally leave their child behind - at home or in a car - to go shopping, or drinking, or whatever. THAT is neglect and should be prosecuted.
What about when a parent forgets their child is in the backseat on a hot day and the child dies. Is that neglect or an oversight?