A rehabilitated biter will still be dangerous in the wrong hands (the general pet owners). Dogs don't forget that biting works well for them. It is a powerful learning experience for a dog. Example; in the training facility where I was trained there was a Rottweiler who had bitten people. They "rehabbed" him through reward and desensitization to the level that he could be among people and did well until.....the vet triggered a button and he bit the vet's face. End of story for the dog. I never, ever trust a biter again.
Those darn Rottweilers! Black and red German dogs! Everyone who owns them claim they are big babies. Or even babysitter dogs -- remember Carl? Yeah, Carl babysitting the kiddies.
But I remember the Cesar Millan-wannabe who had "rehabilitated" an aggressive Rotty, took it to a mall in Africa, and it full out attacked a small child who was just walking by.
These are formidable dogs folks. Those with good temperament are very unlikely to kill someone. But they can send you to the ER. And one with a bad temperament CAN kill someone. And they do not snap and go from sweet, wonderful family pet to killed a 2 year old overnight. Nope. If you want proof of this, go to wikepedia and look up fatalities caused by dogs. They will give you all the fatalities, year by year, with the type of dog or dogs and their breeds or mixes if known, and they will give you, in most cases a little synopsis of the dog. Most of them say that the dogs had previous incidents, sometimes several.
We own formidable dogs. For many of us, that was part of the package we were looking for. But it means we have to be MORE responsible. Someone with a Yorkie or a Cocker van afford to let their animal be rather snotty toward people. If it bites someone, and they do sue, the likely consequences could probably be born even by me: a fine, a visit to a doctor for a tetnus shot, maybe a little for pain and suffering or a day off of work. And a quick apology would probably avoid even that.
But if your Maligator bites someone who steps on its foot, they are going to take you to the bank. If your shepherd or Rottweiler bites someone, pay day just happened, and not only that, but the homeowner's insurance will raise your rate and or drop you, or force you to get rid of the dog. In fact the court might force euthanasia for the dog.
We cannot train all the children in the US not to run up and hug dogs they do not know. We cannot stop every moron who thinks he is the next Cesar from petting or doing something stupid with our dog because he thinks he is God's gift to dogs.
Keeping an animal who might bite, or one that will bite in some circumstances is something folks need to consider hard and be very clear about. Keeping an animal who will maul a family member that it lives with is not only a personal liability, but it also will affect other owners of the breed when what that dog does gets figured in to the dog bite statistics by breed, or, the fatality by dog statistics.