Why NSA spying puts the U.S. in danger

Why NSA spying puts the U.S. in danger: "There are children abused on a daily basis to facilitate online child pornography, yet I know of at least two agents who were pulled from their duties tracking down child abusers to investigate everyone who called the same pizza parlor as a person who received a call from a person who received an overseas call. There are plenty of similar examples. We have snakes in our midst, yet we are chasing a mythical beast with completely unreliable evidence."