It's not the dog that's dangerous. It's the dog's owner.
The ignorant people, calling for outlawing Pittbulls should really get informed. You'd have to outlaw every strong breed of animal.
http://www.fataldogattacks.com/
Fatal dog attacks happen much less often than fatal traffic accidents. Should you be able to own a car if you might accidentally kill somebody with it? Yes but you have to be responsible with your car. The same applies to dogs.