[smacktoward]

Not to mention that the weapons stored in the schools would be a tempting target for theft, or for commandeered use by a hostile intruder.

After all, how elaborate are the protections they are stored behind likely to be? Not very, when you consider that (1) if the weapons are ever needed they'll need to be able to be gotten to fast, and (2) the people responsible for storing them are going to be middle school administrators, not military quartermasters.