I know this old thread, but there a point I wanted to bring up...
Any time any person/animal is attacked by a bull breed dog people say it pitbull. This common misconception. Lots of people don't know the difference between staffy, amstaff and pitbull, so pitbull can get the blame lots when they haven't done anything.
Also, pitbull are very very overbred and mixed. Again, few people can tell what a 'real' pitbull look like. A properly bred pittie is most likely not responsiblr most of pitbull attack we hear.
Just something I feel important to add to conversation.