Maybe that's because Hoover was the first director and died with his boots on. So, even if infinite memories were present... This was atrociously written.
Of course Felt is no hero. There were very few individuals involved in the Watergate scandal who were honorable. It was an exercise in depravity and very discouraging to those of us who watched it unfold.
I remember watching the Senate Select Committee hearings live and being appalled that sleazy twits like John Dean, Donald Segretti, John Erlichmann, etc. had influence in the White House. I'm sure there were good people there, some of them hurt by the shameful shenanigans of others (Hugh Sloan comes to mind), but they were apparently few and far between.
Mark Felt is just another one of them. I am glad that he has come forward, just in the interest of history.