EXACTLY THE POINT! It Is very rare. A dozen to a few dozen incidents a year depending on the information source. . Yet we are all up in arms castigating the people who have this happen.
There are many more incidents of parental negligence that result in a child’s death by people no more or no less forgetful or negligent than these parents. As many kids wander into the bathroom and drown in the toilet every year.
Should every person with a toddler be charged with neglect when they forget to close the bathroom door? Even if it was their eight year old that forgot to close it?
No, the point is you have to be a special kind of moron to forget YOUR KIDS.