Eugene Robinson was right when he said in “Disconnect this NSA program” [op-ed, June 21], “I don’t believe we would be any less safe.”

National Security Agency Chief Gen. Keith B. Alexander testified that surveillance that gathered U.S. phone records had helped prevent dozens of terrorist attacks. The prevention argument is an elephant whistle. In an old story, a salesman went to the jungle to sell elephant whistles to drive the pachyderms away. Frightened jungle residents asked if the device worked. He blew the whistle for them and announced, “Do you see any elephants?”

Francis W. Rodgers, Washington