Go back forty years or so and our local dog shelters were full of labs and lab mixes. This was largely due to the fact that we have a lot of hunters around here and they're hunting dogs. Pit Bulls were largely unheard of. Then dogfighting spread into the area and became more popular and now our shelters are filled almost exclusively with Pit Bulls and their mixes. It's kind of rare to find a lab or lab mix in the shelters anymore.
I've never understood the problem with banning Pit Bulls. What property does a Pit Bull have that you can't find in another breed? Pit Bulls aren't especially attractive dogs. By and large they aren't the smartest dogs around. They don't always have the best temperament. What makes a Pit Bull such an attractive dog that they're now flooding the shelters?
The answer is they fight. Those that won't fight, or aren't good at fighting end up in the shelters. The rest end up in the ring or dead. Dogs that fight well get bred nonstop and their puppies sold for whatever the market will bear. For many of the poorer people in communities buying a Pit Bull is like buying a lottery ticket. If they get the right dog, train it right, and it becomes a good fighter, that one investment can make them a ton of money.
There are lots of animals that can be kept as pets that are banned for one reason or another and most of those banned animals don't kill people. Turtles and tortoises are banned in New Jersey and for the life of me I can't remember the last time I read of an angry tortoise killing it's owner or a passerby. (Yeah, I know they're worried more about salmonella bacteria than temperament, but still, it's a little goofy.)
If Pit Bulls exuded some maigc substance that cured a disease or was otherwise irreplaceable, I'd say fine, don't ban them. Realistically, there's no property that a Pit Bull has, other than fighting, that you can't find in a more stable, less aggressive breed of dog. Why take the chance on owning a Pit Bull when you can find whatever properties you're looking for (other than fighting) in a more stable breed? Google the list of banned animals/pets in any state and you'll find lots of good animals that are banned for whatever reason. Banning Pit Bulls because some of them occasionally kill people isn't such an outrageous idea.
Fly!!! Eagles!!! Fly!!!