It's a bit more indepth than that is it not? There are a lot of dangers and threats out there, would a good parent not protect their children from potential risks? We don't know half the things these agencies know and they believe they have to monitor certain communications so as to keep up with any potential threats, it's a double edged sword, there would be an outcry if there was a terrorist incident that could have been potentially stopped. Apparently agencies like the NSA, although they gather bucket loads of data it's more for reference rather than keeping up-to-date tabs on millions of people. If you have nothing to hide....
Yet the Senate report on NSA data has pointed out that, with the phone metadata at least, it hasn't helped in a single case...
http://edition.cnn.com/2014/01/23/politics/nsa-telephone-records-privacy/
Moreover, the five-member Privacy and Civil Liberties Oversight Board said it's been largely useless in thwarting terrorism.
"We have not identified a single instance involving a threat to the United States in which the program made a concrete difference in the outcome of a counterterrorism investigation," the board wrote in the report released Thursday.