Improvement of data processing = invasion of privacy?
It strikes me there is a confusion between the ability to efficiently collect large amounts of data vs. the potential invasion of privacy. The potential to invade someone's privacy occurred when the state required personally identifiable markings be placed on everyone's car. This is what enabled the police lieutenant to extort money from the gay bar customers, for example. That potential existed long before data logging could be done electronically.
If there is a problem that an unattended data logger can record your presence somewhere, than its also a problem that an actual person can see you at that location. The data logging isn't the issue.
