*sits down in a lotus position and ponders*
Everything has its evil and good sides.
With animals, generally, evil and good are so meshed together that it's all the same to them. As it should be.
We humans can separate the evil and good within us, and can sway more to one side or the other.
While there are evil humans, who destroy, there are also good humans, who create.
Humans who burn forests down, humans that sell everything they have to keep funding a shelter for animals who lost their homes. All sorts of aspects that makes humans look good and bad at the same time.
MidnightDragon is right. Fine lines no longer exist, because humanity erased them when they gave their evil and good sides a name.
I'm not really sure where I was going when this came to my mind, but I feel it has some sort of relevancy.