The idea of wiping out an entire breed is barbaric and will not fix the problem at all. The only solution is correct training techniques and socialization from puppy-hood.
If you adopt a dog, consult your vet on who to speak to about helping you with these two areas listed above for older dogs.
Statistically proven, chained dogs are more likely to attack than well-exercised dogs in fenced yards, simply because they have built up energy, frustration at not being walked and territorial tendencies over its small patch of land. That is why it is so important to avoid chaining your dog for long periods of time with no exercise. If you must chain your dog, please allow for 30 to 40 minutes of walking a day and be sure you're in control of the walk.
When you go to get a dog be sure that the dog is suited to your lifestyle. If your energy level is low a dog such as a Papillion or a Shih Tzu are two excellent examples of dogs that match your energy level. If you're high energy and very in control, a more dominant breed such as a German Shepherd is a good choice. In the same breath, if you are looking for your first dog, please do not consider a more dominant breed as an inexperienced handler. Having a more dominate minded dog is just asking for trouble.
Breed bans are not the answer, correct training and socialization are. We don't need another Holocaust. As Gandhi once said, "The greatness of a nation and its moral progress can be judged by the way its animals are treated."