I understand what you're saying and the point of view from which you're saying it, but the whole idea of propping up Hoover is hypocritical. From the FBI's website on the origins of their motto and logo created in:

But “F B I” is the best and one from which we might well choose our motto, for those initials also represent the three things for which the Bureau and its representatives always stand: “Fidelity - Bravery - Integrity.”

Obviously, Hoover lacked in the integrity department. So, why not just say, hey this guy did things in his past that we're not proud of such as x, y, and z instead of just totally ignoring them?