Let me give you an example of some leaked documents that were actually meaningful:
The Pentagon Papers, were a top-secret United States Department of Defense history of the United States’ political and military involvement in Vietnam from 1945 to 1967. It was commissioned by United States Secretary of Defense Robert S. McNamara in 1967 and completed in 1968. The papers were first brought to the attention of the public on the front page of the New York Times in 1971.
The study was classified as top secret and was not intended for publication. However, contributor Daniel Ellsberg copied and turned over most of the Pentagon Papers to New York Times, which immediately began publishing excerpts in a series of articles. The release of these documents led to street protests, political controversy and numerous lawsuits.
Later, Ellsberg said the documents “demonstrated unconstitutional behavior by a succession of presidents, the violation of their oath and the violation of the oath of every one of their subordinates”. He added that he leaked the papers to end what he perceived to be “a wrongful war”.
Whistle-Blowers: A Conversation with Ellsberg and Dean: