No one is saying that we shouldn’t punish the parents for negligence. Just that it needs to be known that that is what happened and not an accident.

That applies in almost every case a child dies.

Say a child drowns in a pool. Was the child routinely left unattended around the pool (negligence), or was the pool gate not latched this time (accident)?

Say a child dies in a car accident. Was the child not in a safety seat (negligence), or did the buckle not entirely latch (accident).

Or in the case of a gun death. Was the gun left out all the time where the child could get it (negligence), or did they forget to engage the lock on the safe (accident)?

In many cases the answer may never be known by anyone but the parents in all of those examples. But if the gun owner had kids and no lock box or safe, than that could be an indicator of which it is.