As little as I support censorship, I strongly doubt that "news agencies" could be counted on to keep a lid on anything sensitive. There is just too much pressure to "break the story", to get an "exclusive", to beat the competition to the punch. Besides, most "investigative reporters" are simply cowboys who think of themselves as the next Woodward and/or Bernstien (apologies for the inevitable misspellings), and would rather make their mark on the entire industry than restrain themselves in the national interest.