Darker than a Bog Invasion causing billions of deaths and almost wiping out every race inthe Alpha and Beta Quadrants?
Darker than political assasination to manipulate trends in a war?
Darker than genocide?
Darker than Section31?
99% of the time though, Trek major actors are always the morally upstanding people fighting the evil corrupt dark people.
You say that like it's a bad thing. What's wrong with it?