please ban dogs that attack
Perhaps there is a better, more fair way to go about this problem. Rather than ban an entire breed, why not have requirements for owning the breed. For instance, if you own a pit bull, you must provide documentation that he has had obedience training and is not harmful. Or pit bulls could be required to wear muzzles when they are in public.
But to ban someone for having that breed in their own home? That isn't fair to the animal or the people who love this breed? There are many other options. I also think that if you see a pitbull, you should LEAVE IT ALONE unless it's owner is there and has okayed that you interact with it. Are you going to push for banning every potentially dangerous thing to be banned?