There is no record of US mass surveillance ever preventing a large terror attack

Pay no attention to the man behind the curtain. "CIA Director John Brennan wants you to think the Paris attacks were Snowden's fault -- the "hand wringing" over mass surveillance has ended his agency's ability to "thwart" terrorists attacks "before they're carried out." There's only one problem with that: there's no evidence that the US's mass surveillance programs have ever prevented a major terrorist attack." Mass surveillance has never caught a terrorist, the FBI only catches terrorists of their own making. It's almost like they only do this to scare us.
There is no record of US mass surveillance ever preventing a large terror attack
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