The fact of the matter is that there are many breeds of dogs that have aggressive tendancies and high prey drives. This is not the dogs fault, it was bred into the breed many, many years ago. That is not to say that these are bad breeds of dogs, they serve their purpose. Bull Mastiffs, German Sheppards, Rotties, Terriers, Beagles are all among this type of dog. Yet they are used in the army, by police, and hunters.
It is the owner who is responsible in all cases. Those who disagree just do not to take responsibility for their own actions. I have owned aggressive breeds my whole life, yet my dogs have never bit anyone. Why? I train them, they remain on a leash, I crate them when my childrens friends come over, I socialize them with other dogs, I do not train them to be aggressive.
I realize full well the power and the destructive capabilities of my dogs, the same way I know the destructive capabilities of my car. I drive my car responsibly, and I own my dogs responsibly. One must realize that s/he has to be in control of their animals (regardless of size). This is the reason I will not let my 8 year old walk my Mastiff.
In short, I believe that if a dog bites someone, (of course I am not talking if someone breaks into my house, tries to attack me, or something like that that), they should be prosecuted to the full extent of the law. To declare genocide on a breed is just wrong.