I don't think that a character like that has ever existed in ST in any official capacity.
And my players know me well enough to know that if someone like that appeared in one of MY games... he'd almost certainly be right about whatever it was he was doing.
Heck, if he was doing the moral, but massively politically inconvenient thing, they'd probably JOIN him.
By G’Quon I can’t recall the last time I was in a fight like that! No moral ambiguity, no hopeless battle against ancient and overwhelming forces. They were the bad guys, as you say, and we were the good guys! And they made a very satisfying thump when they hit the floor.
"It's hard being an evil genius when everybody else is so stupid" -- Quantum Crook