From the idiotic principal:
Nolan stressed that she is very concerned with “safety and security” and concerned that, somehow, someone could wrongly interpret an image of a gun emblazoned with the universal sign for prohibiting something.
“I think the general public will be alarmed by it and wonder if people have been allowed to bring guns to school in the past,” Nolan also fretted.
"Somehow" someone "could" - yada, yada, yada. We have here someone who cannot understand basic principles of thought, and who clearly has a political agenda she's not being honest about.