Naturally, the 2nd Amendment patriots at Fox News misunderstand the aims of a public service announcement. When a teenager finds a gun (it didn't specify if it was loaded or not), he brings it to school and hands it to an adult teacher. He said,
"Can you take this away? I don't feel safe with a gun around my house."
Katherine Timpf was on to explain how insane this ad is. Because she trusts parents to teach their kid about gun safety, this ad is all wrong. The rudimentary comprehension and poor understanding of the true message is obvious by what they focus upon.
Perhaps bringing the gun to school was a poor idea, but where else can a child find a responsible adult if his family is laden with idiots who keep firearms easily accessible by anyone? And, Ms. Ammosexual, how many damned accidental deaths does one country need before people are held accountable for the mass proliferation and acquisition of these sorts of lethal weapons? Did the PSA explain that maybe the kid's mom is unwilling to teach him or unwilling to hide the weapon from a younger sibling? No, so Fox News and Ms. National Review are appalled at the content of the ad, completely missing the point. Why would you even have a gun within reach of a child or adolescent?
Guns should NEVER be accessed readily by any minor, and more often than not, anyone, period. Guns ABSOLUTELY make the house much more dangerous for the whole family.
Guns in the home greatly increase the risk of youth suicides. That is why the American Academy of Pediatrics has long urged parents to remove guns from their homes.
The person who made the ad said that guns should not be accessible by children.
We can't say the truth, as Fox News is bought and paid for by 2nd Amendment enthusiasts who have worked tirelessly to change the meaning of that amendment. In fact, they recommend prosecution if that ad leads to one person bringing a gun to school, also missing the point that weapons don't make a home safer. 
Remember, pre-1982, before Orrin Hatch and the NRA-ILA decided to re-interpret the amendment to mean exclusively, you have a right to bear arms (and leave off "to form a militia"). It was a turning point in our country, and Congress has worked harder on the mass proliferation of guns than on any other matter.
The kid may face some disciplinary action from the school, but let's focus upon the gist of this ad: guns should NEVER be within the reach of a minor. This is the problem, not the felony of bringing weapons to school. The National Review and Fox News are equally clueless blaming innocent children and gun control advocates and failing to blame the merchants of death, the NRA.
