Privacy Settings Are Not Foolproof
The thing about the Internet is, you're never fully anonymous. Even if you've enabled the strictest privacy settings on your kids' social media accounts, there's still the possibility that their location is out there.
A selfie with a street sign in the background could give away their whereabouts, and a photo with friends could disclose the name of their middle school. It's a scary world out there, and we want to protect them to the best of our ability.