Contemplating the risks and vulnerability this produces is itself part of the terror.

It's possible state-level actors could use public safety hoaxes to cripple an economy in the short-term with panics and interruption of events and in the long-term by preventing published in-person meetings of people for any purpose, including education.

Domestic criminal mischief, by teens or adults, scaled by technical means could also accomplish the same ends.

Perhaps police departments and education institutions will need to filter emergency comms to require origination from a STIR/SHAKEN-valid source.