I do not think true evil exists at all.
I mean how can evil ever be the main goal in any action? People perform actions in order to gain something, be it satisfaction, wealth, respect or what ever. Evil for the sake of itself is absurd, and serves no purpose.
It is all just about perspective. Do you think Hitler thought of himself as evil? Or Stalin? They both did what they thought to be necessary and right at the time of their actions, even if those who got hurt from them obviously thought something else.