[quote=@Fallenreaper]
<Snipped quote by Dervish>

I usually define evil as point of view, namely what their motivates are and how deep they relate to the outside world. A really good villain to me is someone who's dark actions actually have some good aftermath because it establishes them as sort of a needed evil rather than just evil to be stopped. Which brings that moral aspect into play: do you merely destroy the evil and basically accept their fall will ripple off to hurt innocents that don't deserve the aftermath or allow the evil to continue and risk other innocents to suffer from their actions? 

Realistically, when you don't actually think of this as a story are pretty harsh choices either way.   
[/quote]

Moral grey areas are where I like to play most for exactly the reasons you mentioned. "evil for the sake of evil" is just boring, I like it when the bad guys think they're doing the right thing based on what their goals are, or the ends justify the means kind of thing.