Don't know how this women's dog was raised.
But my experience in general, is that how a dog behaves, is due its owner.
If the owner's fragile ego demands they own a vicious attack dog, that is what they will raise.
We have baby sat an adult pit bull for a week at a time, and it was one the most gentle, affectionate, smart dogs I have experienced.
With a young child on the floor, he would crawl over to the child, so as to not scare it.
This without any training to do so, so we can't put all pit bulls in the same bucket, just as we can't put all people of any race, cultures in the same bucket, good and bad in every one of them.