The thing with intelligence agencies isn’t about the information they collect or apread but the means and methods of they collect or spread information.
If ABC intelligence agency knows someone is a double agent feeding state secrets to XYZ foreign agency, that double agent can go be unknowingly molded into an asset for ABC by feeding them inaccurate information, or their patterns can be used to uncover other undiscovered agents and gain insights into other potential security holes.
The thing with intelligence agencies isn’t about the information they collect or apread but the means and methods of they collect or spread information.
If ABC intelligence agency knows someone is a double agent feeding state secrets to XYZ foreign agency, that double agent can go be unknowingly molded into an asset for ABC by feeding them inaccurate information, or their patterns can be used to uncover other undiscovered agents and gain insights into other potential security holes.