I realize that this is quite tangential to the thread, but I have to disagree with your characterization of Watergate. While I agree with you that there are things to admire in Nixon's actual political positions, his conduct was both flagrantly criminal and genuinely singular. The sheer degree to which power was abused by Nixon and his direct subordinates went beyond that of any other President of the modern era.
Nixon tried something of this defense himself, as he tried to promote a narrative that "everybody does it". This was true only to a degree, but Nixon seemed to believe it too much himself. For example, he was convinced that LBJ had bugged him, though evidence suggests that LBJ did not.
Felt certainly was upset about being passed over for promotion, but he seems to have also been genuinely opposed to how Nixon ran the FBI. Mostly, Felt wanted the FBI to be independent rather than controlled by the White House, which is not necessarily "good government" but clearly revenge was not his only motive. I agree that Felt's conduct during Watergate was not admirable, and he certainly did some other unrelated bad things (
Mark Felt - Wikipedia, the free encyclopedia).
There's no denying though that Darth Vader eventually redeemed himself-- that's canonical.