Really, why is it that governments feel they must track our every movement, our every interaction? The answer is that governments - no matter how well they start off - all eventually end up seeking to fully control the lives of their citizens: it seems to be some sort of unavoidable emergent property of large aggregations of people. The idea of a citizen having some degree of personal sovereignty just falls by the wayside and everybody just gets swept up in the imperatives of the government. This may seem innocuous - or even benign to the naive - but the long term result is that it is a seeking of control for the sake of having control. Being traced like this can hardly be considered to be in the best interests of individual people.