The force is in balance.
Nomen karr is a shame of jedi, but in Balmorra, a new jedi/non-force user can kill a Darth.
In Corelia, 3 stupid Darth died one by one.
The shame is in balance.
About the most poweful one,
Luke >> Vitiate
And dark side=empire; light side=democracy
This is the reason dark side always fail, SW is come from US.