Personally, I think the idea of sending a mass notification to all phones in the province to find an abducted or missing child, that's fine.

It doesn't have to be accompanied with a loud alarm tone, though. Anyone awake can still keep watch with a silent notif, and anyone asleep will not start looking for the people or car in question just because of the tone.

The loud alarm should only be for earthquakes, fire or tsunami evacuation, mass murderer at large or war situation. Since I'd immediately dismissed the alert, if it was serious, I could be dead if I didn't go back to pull up message to know to take cover or evacuate.