However, lack of aggression toward humans is characteristic of the breed, which makes the breed a poor choice as a guard dog. (dogcare.dailypuppy.com)
A 2008 study found that pit bulls displayed no greater aggression toward humans than many other dog breeds, though they were slightly more aggressive than some toward other dogs. (animals.howstuffworks.com)
Unless the dog has shown aggression toward humans, killing another animal does not mean the dog would hurt a person. (vin.com)