I have no horse (or dog) in this race but this thread is short on statistics and long on anecdote.
http://www.la-spca.org/dedication/talk/t_judge.htm
In 37 years, 342 children were killed by dogs, an average of about nine children a year. Shockingly, approximately three children are killed each day, or 1,100 per year, by their parents. Delise notes that "A child in the United States is over 100 times more likely to be killed by his or her parent or caretaker than by a dog."
Pit bull and pit mixes account for 21 percent of all human fatalities, while mixed breed dogs account for 16 percent and other nonspecified breeds, 15 percent. Delise's study demonstrates that the breed of dog should not be the sole factor by which an attack is judged. Other factors include inherited and learned behaviors, genetics, breeding, temperament, surgical sterilization, environmental stresses, owner responsibility, victim behavior, size and age, timing, and the physical condition and the size of dog.
I would like to see more case studies such as this
They also discuss some of the other factors