I don't think those incidents are anything except illustrations of criminal adult negligence. Their use is to forcefully instruct firearms owners how to secure their weapons in a way appropriate to the circumstances.
What do we do when kids drown in a pool, walk out in traffic, ingest something toxic, or otherwise injure or kill themselves with other inanimate objects due to adult negligence?
We punish the negligent adult.
What is it about the emotional derangement with gun control ideology that somehow imbues franchise to that specific inanimate object and demands IT be changed from an already perfectly functional form, to compensate for blatant human negligence?
You wouldn't be making these suggestions if the kids had stabbed themselves with a loose utility knife, brained themselves with a tire iron, or drank a mouthful of brake fluid.