I think that fiction is an excellent place for us to struggle with questions of good and evil, and humanity and inhumanity.

This is a struggle of good and evil. And we're the good.

I don't think good and evil are polarized.

Life is neither good or evil, but only a place for good and evil.

There was the kind of silence there might have been on the day before Creation.
Adam stood smiling at the two of them, a small figure perfectly poised exactly between Heaven and Hell.
Crowley grabbed Aziraphale's arm. "You know what happened?" he hissed excitedly. "He was left alone! He grew up human! He's not Evil Incarnate or Good Incarnate, he's just...a human incarnate-

No matter how hard Evil tries, it can never quite match up to the power of Good, because Evil is ultimately self-destructive. Evil may set out to corrupt others, but in the process corrupts itself. That's just the way Evil is. All things considered, it's better to be on the side of Good, even if Evil occasionally has nicer uniforms.