The concept of collecting and storing all sorts of data and information on everyone just in case someone bad does something is a flawed one.

The government is collecting all phone call information, numbers, location, duration, along with SMS, email, and who knows what else on everybody in order to have that data "just in case" a terrorist attack happens, so they can (possibly) track down the perpetrators.

Now we have police collecting license plate data, along with GPS coordinates, video and still cameras mounted all over cities that can easily allow for facial recognition, combined with the tracking of your phone as mentioned above. It's not a stretch to assume that if the government (NSA/CIA/FBI) wants to know where you are at any given moment, they know.

All this "just in case" one of the infinitesimally unlikely events such as a terrorist attack or kidnapping occurs. For the children. And because terrorism.

The potential for abuse is huge and the cost/benefit is not even close to worth it—unless the stated purpose for collecting the data is not the real one.