In general or this shit specifically? I'm not sure why you would need this sort of status for kids.

In general though, well a natural or man made disaster can happen suddenly, and you probably want to know where your kid is then, especially if you are fleeing for your life.

Also, kids get kidnapped. Some kids run away. Also there are bad people in the internet, horrible people that find kids attractive and then groom children or teens.

Having a kid, and I don't myself have one but my sister does, seems to involve a lot of worrying about bad shit happening. Kids don't always make the best decisions on their own. Neither do teens; and if someone is late for curfew, checking the app when they don't answer there phone is better than frantically calling hospitals.