The truth is that accross the US as a WHOLE, over the course of 35 years, Pit bulls have been either responsible for or BLAMED for 2.48 deaths per YEAR on average. Also, pits have a better temperment than lots of other breeds of dogs. If you ban ANY breed of dog, then you are postponing the problem because the same thugs that train these dogs to fight, will simply find another breed to fight. Make tougher legislation against the idiot owners, and you may find that things begin to get a bit better.
EDIT - I own a Pit MIX, along with 3 other dogs. One is a German Shepherd, one is an australian Dingo, and the other is a Patterdale Terrier. The patterdale LOOKS like a small pit. And would probably be classified as a pit if it were to be loose.
Another FACT, MOST people don't know what a real American Pit bull terrier even looks like. More FACT - Even the head of Hillsborough Animal Control says his officers can't tell the difference in a pit from another breed which is similar.