My general understanding of the difference here is that, while you&#x27;re correct that we don&#x27;t want any of our information- our mail, phone calls, movements, etc.- to be abused and give us problems, the issue here is that law enforcement DOES have a legal and legitimate need to look at all those things sometimes <i>with a warrant, issued by a judge, who has reviewed the evidence collected so far and deemed there to be probable cause</i>.<p>The situation we fear will come about instead is this one: law enforcement has access to all of our data, uses our data to <i>find</i> probable cause, present this to a judge, and arrest us.<p>It&#x27;s upside down- law enforcement is supposed to be limited in what it can do until it &#x27;picks up the scent&#x27; of criminal activity, after which it can use an expanded power set.  If we give law enforcement a greatly expanded power set to use <i>before</i> it has &#x27;picked up the scent&#x27; of criminal activity, we would foolish not to expect all kinds of abuse (especially given the nature of &#x27;big data&#x27;-driven methods of &#x27;picking up the scent&#x27;).