In Fablehaven: Grip of the Shadow Plague, magic creatures are affiliated with either light or darkness. Light things are often kind or helpful, where dark creatures are often cruel and dangerous. There are even magic curses which can change a creature's light-darkness affiliation, one-eightying their whole personality and all their values. But a distinction is drawn, by one of the characters--an old man, whose life's work was protecting a place where different magic creatures could live safe from humans and each other--, between "dark" and evil.
A dark creature simply acts according to its nature--no more morally culpable than a hungry bear. If a bear ate your leg, you'd be upset with the whole situation, but--goes the claim--you wouldn't blame the bear the way you'd blame a human.
Magic creatures are a fact of life, in the world of Fablehaven, like bears and inclement weather. You can appreciate them on their own merits--from a safe distance--and you can even want the best for them. But you won't get anywhere by expecting them to be something other than what they are, or condemning them for not.
And that's why you'd lying if you said you accepted giraffe-girl's apology. You don't consider her a moral agent in the relevant way.