I've always thought the corruption and problem wasn't with the rank and file agents out in the field offices across the country.
Like with most things in DC...at the FBI the fish rots from the head down.
I saw that in major commercial corporations. The people working for the company were enthusiastic, hard-working, honest people. But the higher up you go, especially at the top, the more you see dirty personal greed, corruption, and vice.
We have all seen cases where the CEO and top officials, didn't really care about the company and its employees as much as they do for their own personal gains and golden parachutes. They only care about themselves.
Must be the air up there on those top floors. The higher they go, the more money they make, the more money they want, at any costs. And enough is never enough.
It is the same thing in government.