This has less to do with "shit head 20 somethings" then the modern trajectory of keeping tabs on your children in any and all circumstance. Compare the ideas presented in this story with the recent stories of parents getting Child Protective Services called on them for letting their children walk home unattended. This is just an extension to the idea that children (or young adults) can't be trusted to act properly on their own, and must be under parental--or failing that, state--surveillance at all times.
Somethings gone horribly awry in our society when we can't even trust a young adult to act according to traffic laws and this technology is simply a proxy for the idea that children/young adults need to be under constant supervision, lest they have the temerity to develop an autonomous identity.
How in the hell did civilization ever manage to develop as far as it has without children and young adults being under the constant watchful eye of parents or other authority figures? If you find yourself asking why people aren't more concerned with shit like the NSA's surveillance, look at stories like this, where people are encourage to distrust their own flesh and blood to be able to make responsible decisions! How much longer until we're deluged with stories about chipping children, much like we chip pets, in order to ensure they're safe at all times!
The security state flourishes in this country because we want so much to be safe that we'll give anything and everything for even a slight increase in the feeling that we (and our children) are safe from anything and everything, thanks to the valiant efforts of our security services and corporations.
Let's not pretend for a second that the companies pushing this technology give a flying fuck about the safety of your kids, they want more data, more control, more ways to encroach on areas that used to be free from opportunities for advertisement and the wholesale monetization of human existence. You don't need to know the exact location of your 20 year old kid, you don't need the peace of mind that they're not speeding and sowing chaos. You want it because you've bought into the idea that everything and everyone is out to get you and yours and only the crushing embrace of the modern security apparatus will grant it to you.
Congratulations, you know where your kid is at all times, and in the process crushed the humanity out of them in preparation for the cradle to grave security state surveillance they'll be subjected to.
Good fucking job America.