You know, down history, wolves have always been associated with "bad" that the term "big bad wolf" gets stuck with us through centuries to centuries, generations to generations. Though wolves are predators, so are tigers and lions. In some cultures, wolves are also considered as a part of witchcraft, and even being linked with the devil, vampires, etc.
In the famous fairy tale of our time, the story of Red Riding Hood is still fresh in our mind, and it is one of the stories that are told to children.