From a recent PBS transcript, David Brooks has been very publicly engaging in ad hominem attacks on Snowden. That's just fine — you can tell his case is weak because he's resorting to the weakest of all arguments: the ad hominem attack. But the justification for mass data sweeps makes no sense. He says:
He betrayed the cause of liberty, because, if you don't have mass data sweeps, well, then these agencies are going to want to go back to the old-fashioned eavesdropping, which is a lot more intrusive.
This statement is plainly false. "Old fashioned" eavesdropping is actually far less intrusive than what we're talking about today. Eavesdropping on a telephone conversation on an analog telephone (e.g. back in the day when J Edgar Hoover wiretapped Martin Luther King Jr.) required a court order, and actual people to record and listen in on specific conversations in realtime.
You could only eavesdrop on a specific person at one time. Now there's infinite lookback on anything you've written, who you've talked to, and any email, text message, or IM for your entire life. That was one of the most important topics of Laura Poitras's NY Times mini-documentary "The Program", with NSA whistleblower William Binney. A 32-year old NSA insider turned whistleblower, William Binney describes the actual goal of NSA surveillance:
This is the shift. Now we live in an age of infinite storage! We are only now capable of keeping every aspect of our lives accessible at any time, within milliseconds. We find great utility in it, and we entrust our greatest tech companies in the world with our data: Facebook, Twitter, and Google.
Think of a domain as an activity. A specific type of activity. Phone calls. Banking is another. If you think of graphing each domain, and then each graph turn it in the third dimension... pulling together all the attributes that any individual has in every domain, so that now I can pull your entire life together from all those domains and map it out and show your entire life over time.