So what you're doing is assuming they failed as dog owners, which might be true, but if people like that can fail, they should not own dogs that have been BRED to attack and kill, and weigh 100 pounds. The bar for "good" dog owner is just too damn high, and if it's that high, they should be licensed and ownership restricted to the 1/100 or 1/1,000 families who have the time and skill to properly raise such a dog, and maintain that training for the life of the dogs.
Second, the stats don't lie. Dogs BRED to fight and kill are responsible for the vast majority of deaths. They are doing the job nature intends them to do. Maybe half of those deaths are of the owners themselves, or their family. These dogs are like loaded shotguns. If we want people owning them, and not PERMANENTLY behind a 10 foot barbed wire fence, there should be something required to prove they can be the Dog Whisperer with these animals.
Finally, the "it's not the dog, it's the owner" is nonsense IMO. Again, there are many millions more lab owners, millions of really ****ty lab owners. Their mistakes almost never result in the death or maiming of people by their dogs. The problem is dogs bred to fight and kill do a good job maiming and killing WHEN they go off.