Leaks have always been strategic.
I remember some famous journalist (not Woodward or Bernstein, but of that stature) say that he always asks "What is the agenda of the person giving me this information?"
Anytime you see unsourced quotes from government officials, you know that someone is running a shadow campaign for or against the executive and, even for the experienced investigative journalist, it's not always obvious which it is. I think it's in Dune where the recurring quote is "A feint within a feint within a feint."