I dont believe that to be true at all. There is no such thing as a naturally evil doberman any more than there is a naturally evil poodle or a Jack Russell terrier.
I firmly believe its how the dog is trained, not its breed.
Poodles are naturally evil.
Sorry, on this you would be wrong. We had long discussions about this breed and this one dog, as he was a breeder he would know. He loved this dog as he did the rest of the other dobermans he had and knew a lot about training animals (a horse trainer asked to train horses for the Kentucky derby). This one dog out of the ones he had bred was naturally mean, not trained to be mean. He kept the animal instead of selling it, thinking that he would have the best chance of watching over the animal.
As some people are crazy, some animals are also. Some breeds tend to produce more of vicious dogs than others because of inbreeding, others breeds the inbreeding causes other problem such as joint problems in English Bulldogs.