If pits are so easily misidentified, then one would have to look at the other side of the coin. How many pits are misidentified as labs? It's a two way street.
The pit nutters like to say that pits are abused and that is why they attack. So can we say that hounds will only hunt if they are abused or border collies will only herd if they are abused? Or that hounds can only hunt if they are trained to do so, etc? It's like saying that breeds can only do what they were designed to do if they are trained. Dogs are a clean slate when they are born? No instincts, nothing? If that is the case, then why have breeds at all? If dogs can be trained, then why not train a chihuahua to herd?