That's what everyone says at first. The dark side doesn't necessarily ensnare you by temptation, more by justification. You do something that is easily justified, and you keep going until white becomes grey, and grey becomes black, and you wonder when the white left.
Peace is a lie, there is only passion.
Through passion, I gain strength.
Through strength, I gain power.
Through power, I gain victory.
Through victory, my chains are broken.
The Force shall free me.
-The Code of the Sith
In mourning . . .