@umbra21 - I would argue that it's all a moot point. Personal tracking devices are common now, and really you can track someone off their cell phone anyway.
When a technology exists, there will always be people who take advantage of it. You can argue that people shouldn't be tracking their kids in a bad way, but if they are the kind of people to do that, they'll use whatever they have at their disposal to do it.
That shouldn't stop the people who just want to keep their kids safe from using the technology as well.