The education system - by and large - is primarily working to create obedient little robots which will obey instruction from authority without questioning the logic, or morality, of that instruction.
Any parents who have children strong enough to take the strain should be CAUSING these incidents to occur.
SEND kids to school with 'guns' in the form of pictures, mimicry, and conversations.
MAKE teachers take action to remove the offending element.
OVERLOAD the community with news of intolerance in the local schools.
ENCOURAGE teachers to become embarrassments in their districts.
If parents will outfit their kids with T-shirts, backpacks, and lunchboxes sporting that picture of Obama shooting skeet ... educators will short circuit.