Just as much damage can be done by an owner of say a lab who completely ignores the dog aggression and human aggression that many have shown.

Many dogs who haven't been bred for fighting can be just as dog aggressive as those that are bred for fighting. And many who have been bred to fight can be total pussy cats. Take Hank, the dog fighters dog who was doomed to death as a bait dog, to train the others to fight. Apparently he just rolled over onto his back and waited for it all to be over. Luckily, we got him in time. He now lives with cats, kids and other dogs. It's not all in the breeding, and it's not all in how you raise them. There are many variable factors that must be considered.

Dog aggression and human aggression are two totally different things and should not be confused or used interchangably.