The main problem with the "pit bull" is that a "pit bull" is not even a specific breed, but a group of breeds, and most people can't identify them. The CDC initially released a report many years ago suggesting that "pit bull" type dogs accounting for a certain percentage of dog fatalities. Now they will no longer release statistics because breed reporting is often grossly inaccurate.
Although pits were initially bred for dogfighting, you have to understand that a dog who will bite a human being in the ring is a liability. When two people are in a ring with two fighting dogs, the only way to stay unharmed is to only breed those with the strongest bite inhibition towards people. Unfortunately, most of the dogs today are poorly bred, and dogfighting (although always a vile sport) today is especially abusive, and literally abuse the dogs to make them fight.
Remember the Vick dogs? The horrible vicious killer dogs? 1 of the entire group had to be euthanized, and these dogs were in the ring, trained to fight, and often abused to goad them into doing so.
Pit bulls, are, at their heart, people dogs, and I have rarely seen a breed which will cleave so closely to their human families. But when people who know nothing about the breed buy them and try to make them "tough", neglect them, and leave the outside, it seems tragic to blame the dogs and ban them. Ban bad ownership. Step up and enforce the laws we already have and make new ones designed to stop this.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry