I ran across this quote today and thought it very appropriate here:
No. No wolf wastes time on vengeance, and that is what this is. Vengeance, pure and simple. When people look most vicious, what you are seeing is not their animal side. It is the savagery that only humans can muster. When you see me loyal to my family, then you see the wolf.
Fitz in Robin Hobb's Fool's Fate from the Tawny Man series