The Trace is an anti-gun, propaganda site. You can check that out for yourself. They seek to drive emotional reactionism as a tactic to attack Second Amendment rights.
Most gun owners are very safety conscious. Essentially all gun owning parents love their children and want to keep them safe. Just like in vehicle wrecks, poisoning, or during sports, children sometimes accidentally die, and sometimes its due to negligence.
There are already laws about criminal negligence. If applicable, they should be applied. However, this article is driving for all guns in private homes to be placed under lock and key. Such laws would effectively eliminate a person's right to self-defense in the home using their own firearm. It's a straight-up attack on natural rights and the Second Amendment.