The point is that the drone is fast enough to arrive first, and do the searching so that you don't have to. It's just one of many possible scenarios.
I totally understand the argument that this might not be the most effective use of money, but I honestly don't understand the lack of appreciation for the number of places this could be used effectively.
Yes, the drones should be secure. Yes there should be measures to make sure that they're not abused. But none of that takes away from anything i've said, which is ONLY to point out the situations where they could be useful. And people seem to be having a very negative visceral reaction to even considering the possibility.
Also, i'm not recommending or supporting Flock, just the concept of drone use in general.