Thank God our schools know better then these parents do. School administrators don't want to teach kids to discriminate between proper and improper gun behavior. That's why many public schools have banned gun-safety videos offered by the NRA for kids. Better to have a few shot-off fingers on the hands of ignorant kids then to spread the dangerous message that gun ownership is normal. But the issue is bigger than guns.
Schools know better than to discriminate at all.
It doesn't matter, at school anyway, because the children are all punished regardless of whether a bunch of whiny, busybody parents believe anyone's safety has been threatened. Besides, Christopher isn't being punished for threatening actual harm with an unregistered luncheon item. He's being punished for intending real harm. Of course, Christopher had to be punished even though he didn't actually hurt anyone, because he intended to hurt someone. And even if he didn't actually intend to hurt anyone, he had to be punished because it might have looked like he intended to hurt someone.