[detst]

While I generally agree with you, I think this can be done properly. Track and notify the kid every time their location information is accessed. They say they'll be home absolutely no later than midnight. Parents call at 12:30am with no answer. They try again at 12:45am without an answer and finally check location at 1:00am. The kid knows they are late, sees two missed calls on their phone, finally followed by the location check.

I think that's a legitimate use that would be agreeable to most kids. While abductions numbers are low, things do happen to kids; being able to get their location when something seems wrong is a legitimate use, IMO. Sure it can be abused, but those parents are already invading their privacy in other ways.