yes aggression is genetic to a point. but in saying that pitbulls have not been used in the ring for multiple generations and responsible breeders have been breeding the DOG aggression out of them for just as long. The problem is not the breeds, it is the owners that have no idea how to handle their dogs. ie the bogan that play fights with his dog that has not obedience training what so ever (just because you can yell at your dog to go lay down and it runs off or it sits after you tell it to 3 or 4 times doesn't mean its trained). I have 2 German Shepherds that are professionally trained attack dogs and we have had the same if not more training then the dogs. If my wife and I were irresponsible owners the dogs would be very dangerous. I don't think that pitbulls should be banned because I think they pose the same risk as any large dog. I do believe all dog owners should have to do a handling course as well as temperament tests on the dog to register/own any breed.