Hersh revealed the My Lai massacre in Vietnam and the secret bombing of Cambodia, Parry exposed Iran-Contra, a drugs and gun-running conspiracy that led to the White House. In 2016, they separately produced compelling evidence that the Assad government in Syria had not used chemical weapons. They were not forgiven.
When he was US commander in Afghanistan, General David Petraeus declared what he called “a war of perception… conducted continuously using the news media”. What really mattered was not the facts but the way the story played in the United States. The undeclared enemy was, as always, an informed and critical public at home.