Turns out, 95% of the predators already know exactly where the victims are, usually because it's their kid. Probably we want to worry about that a lot more.
Doubly so since, y'know, this only works if the predator lives close enough to act on the information before it changes - so the tiny possibility of a predator, a tiny possibility that they didn't already know this, and a tiny possibility of being able to act on the information...