While it's easy to criticize the keys being in close proximity to the locked firearm. How many keeps the keys to their gun safe, gun cabinet, gun locks somewhere in the home? Keep them in an easy to access location close by where the firearms are stored? Keep them in a desk or nightstand drawer? Keep them in the same room as the guns or down the hall from the guns?
The keys were in the same box the lockbox were in. That is like none of the examples you gave. That is like leaving the key to the safe tied to a string attached to the safe. 1 key to my gun safe, on my person 24/7.
If one looks at the mother's other statement(s), particularly her comments after settling with the gun owner for $1 million, they'll see what the next step will be. Hold the gun owner responsible simply for having the gun in the home.
The homowner is liable for his children's actions. Which includes showing off the firearm. That is the take away from this. Make sure your kids know not only safe firearms handling, but not to let people know where firearms are + how to access them.
As already point out, her desire for government to mandate how people store their guns is affecting people who don't even have kids and may not ever have kids in their home. And as we saw in CT, her group relentlessly demands the "safe storage" laws be expanded every year. Because of her group, CT has gone from having the gun locked up if a 16 year old or younger lives in the home, to an 18 year old or younger in the home, to everyone has to lock up their guns even if they don't have kids in the home. No doubt next legislative session, next month, they'll be back with more demands.
I personally am in favor of removing all warning labels and "protections" and bringing back Darwin Awards for Humanity.