Or worse still, what if the definition of what is "safe" changes, following some sort of incident (9/11?) Once they have amassed all this data about you they c

Or worse still, what if the definition of what is "safe" changes, following some sort of incident (9/11?) Once they have amassed all this data about you they can mine it to their heart's content and use it to make predictions - those books you read before the "incident" that seemed innocent now get you flagged as a potential terrorist.