I disagree, there is a time and a place for everything. Today we wonder how we managed before cell phones. Well I can tell you this, I didn’t allow my then teenage children to get into the car alone without a cell phone. That was the high tech device that I needed for my sense of security. That was the rule, if you take the car you take a cell phone and they didn’t use it to talk on like today it was too expensive and more respected, they had it in case of an emergency so you can call us right away.
There is nothing wrong with using whatever technology is available for the sake of safety and peace of mind. If that is what a parent feels will give them peace of mind when a child is walking alone somewhere, or when a child is first allowed to walk home alone, or till they reach a certain age where a parent is more secure that they know how to ask for help or know better how to take care of themselves then why not? We are not handing out cell phones to kids so if this is something parents can do to keep track of their children then why not? Obviously if a parent is trying to track a teen, the teen will not wear it, so that argument is worthless.