Claiming ignorance to avoid solving a problem is weak or deceptive.
These dogs are bred to be strong. To kill. They don't belong in homes and society near children. They should never have been bred in the first place nor imported, but that happened, so gotta deal with it.
People buy these dogs to be intimidating. Compensating for something, I expect. If people are licensed and can prove training, fine, keep them, but if they have already been raised bad, it's probably too late and too risky. A school girls runs past, and bam, disfigured.
To save dogs, you would advocate killing the children of slaves? The lengths you'll go...
I know the debate about nature vs nurture and it's relevant in some debates. Not this one. People do not have lions and tigers as pets. Some zoo owners probably feel they're passive with the right ownership. Doesn't make owning them good and sensible. If people cannot act sensibly (and they won't), legislation has to kick in.
It is a viscious cycle, and I dont disagree that owners are part of the problem. Shrugging and going "ah well" doesn't fix the problem. Doing nothing gives owners almost the legal freedom to use their dogs to kill folk and get away with it.