<blockquote>In other words, the problem in this case was not a lack of data, but a failure to act on information authorities already had.</blockquote>
via <a href="http://www.nytimes.com/2015/11/18/opinion/mass-surveillance-isnt-the-answer-to-fighting-terrorism.html?_r=0">Mass Surveillance Isn’t the Answer to Fighting Terrorism - The New York Times</a>.