Personally, I hate when people discriminant against the pit bull breed. Sure, they can do terrible things like this one did but really, can't any breed of dog? Some of the nicest dogs I have met were Pit Bulls and one of the nastiest dogs I have encountered was a Labrador. It is all dependent on how you raise them and take care of them, just like any kind of pet. Hell, my aunt had a Chihuahua that I was terrified of because he was so mean.
What the dog did was terrible and I am very sorry for the family, but I don't think we should discriminate again the whole breed..