My tinfoil hat theory is that Drones are far better at mass surveillance than current emergency alert systems, so while the advantage over the existing emergency alert system is probably negligible - it opens the door for people accepting having drones everywhere and constantly overhead which is the real goal.
For a second layer of tinfoil, having a strong drone presence (production, infrastructure, technology) in the economy seems like it will be very useful for future wars. Whoever has the largest and smartest swarm wins