I have had 2 purebred Rots. Hand raised family type. If someone drove up in the yard ( barn) they would go out to greet them with the hair on their back raised, do one "wolf" at them, and go to tail wagging. The origin of the breed was medieval times, used as guard and stock dogs. If I had a horse slow to get in his stall or trailer the Rot was right their at their heels they did not nip as I would assume, but they get the sucker in where it was aimed!! They had a lot of stock instinct.
That was my personal experience with that breed. If not raised right, they could be bad no doubt. If we were not home, and stranger tried to be there, I bet they could get bad quick.
I do not doubt those bite stats, I can see Rots inflicting harm. Just because a dog is totally loving to the owner/family does not mean it will be so to all.