Dawn may be innocent, but she is certainly not sweet. I just rewatched 'Grave', and did you see the look on her face after she cut that monsters head off? I'm telling you, the girl likes the violence, and she wanted Warren's blood, at least she did voice a strong desire to kill him. I do believe given the oppurtunity that Dawn would have killed him. And of course we have all her klepto issues, if Dawn ever gets some sort of superpower, Buffy better try teach her some morals, for everyones safety.