If you live in the USofA, you are in more danger of being killed by someone in your family than by a terrorist.
I see where you're going, and fair enough on a statistical basis. But my family is composed of good, just, and law-abiding people. They are not the people I am worried about dying from
The question is whether you believe there are more terrorists in the USofA or more bad cops/contractors/other-people-with-access-to-track-your-daughter.
Without question, the former. My daughter is being raised to say yes sir and no sir, please and thank you. A proper respect for authority (be it her parents or police) but also the wisdom to understand that humans are not perfect.
You know who has trouble with "bad cops?" The people who don't respect authority in the first place. The people who have done things that harm others and the society at large. My daughter will never be in a confrontation with the authorities - never become a Michael Brown - because she has been raised to understand the need for the police and for keeping the peace (as much as I can teach her).
Once you sign away her privacy she probably won't be getting it back.
I grew up through the end of the cold war, the rise of the Internet, and the integration of Lawful Intercept into telephone communications. I am still here, still free, and still have my privacy. This is no different, and I expect to be able to say the same about my privacy 30 years down the line.