That’s not the purpose of them.Apple should disable the “you are being tracked by an Airtag” feature. It would make Airtags far more useful in cars to prevent theft and keeping an airtag in your kid's backpack to track the kids whereabouts.
1) they don’t prevent theft, they may help the vehicle be located.
2) tracking a child’s location is creepy, and shows lack of parenting. If you need to do that, give them the AirTag and let them disable notifications. Too many creeps out there already.