Re: In defense of data slurping
Concern about possibilities for misuse of collected metadata has a rational and historical basis in the US and perhaps more so in some other countries. Unfortunately, sloppy use of the English language (and doubtless others) in reporting on the "Snowden revelations" combined with widespread underlying distrust of government activities has whipped up a certain part of the population into a moral panic not greatly different from the satanic ritual abuse panic of 25 or 30 years ago.
At the root is a widespread sense that the Government is not to be trusted, that its operators view themselves as better than the rest of us and therefore entitled to make the rules and to to establish and operate the agencies and programs that govern us for our own good irrespective of our wishes. They supply confirmation in the form of comments like Jonathan Gruber's recently outed description of the tactics used to obtain passage of the Affordable Care Act and their rationale, as well as the presumed Presidential action to revise enforcement of US immigration laws, details of which are to be announced this evening. To worsen things, such actions tend to be supported enthusiastically by their supporters without much consideration of the possibility that another President and Congress might act quite differently, although surely "for our own good".
Conflation of "logging" with "spying" and portrayal of the government's capability to track pretty much anyone as a fact that the government tracks pretty much everyone feeds the diffuse general anxiety about whether the government officials consider themselves our masters or our agents. Selective reporting that tended to omit context, conflate foreign and domestic data collection, overlook NSA's internal controls, and deprecate the Foreign Intelligence Surveillance Court except where it found fault with NSA activities have further contributed to a widespread sense that the government is to be distrusted and feared, and the program needs to be stopped, this despite the fact that it has not been shown to be instrumental in any oppression.
The truth is that if you are a target of government interest, there is not a lot you can do about it and they very likely will get you if they want. They can collect your metadata, as well as that of your contacts and their contacts from providers without a warrant and without notification. They can conduct physical surveillance without much justification, and a police officer behind your car will query a variety of databases for your license plate if he has the time. They can conduct heavily armed raids based on sometimes flimsy justification: Randy Weaver, David Koresh and the Branch Davidians, and the YFZ Ranch come readily to mind as probable government overreach. The government's prosecutors can use old or badly written laws to lay on outrageously excessive charges - Aaron Swartz and the Ohio Amish beard cutters, as well as a number of whistle blowers, are recent examples. And the governments' police can seize your property if they think it was used for or resulted from illegal activity. And not a bit of this is even remotely dependent on "mass surveillance", electronic or otherwise.
Jason Bloomberg is quite correct. The US communication metadata is potentially useful after the fact in finding those responsible for criminal (including terrorist) acts. The notion that it can be used prospectively to detect and thwart terrorism and other crimes probably is as much a pipe dream now as when Admiral Poindexter prototyped and advocated the canceled "Total Information Awareness" program. That is indicated by the scarcity of evidence offered by the NSA (and, as far as I know, the other Five Eyes SIGINT agencies), and the data would be similarly (un)useful for identifying anti-government domestic activity.