Nice that we agree that it´s generally always the owners fault if something goes wrong but it´s also a fact that different dog breeds have different aggression potentials and thereby are more or less difficult to train and control. So choosing a dog breed that is not more aggressive than necessary is also part of the owners responsibility. I for myself would never choose a breed that has been bred to fight, bite and not let go, as a family dog. Instead I would choose a Bernese for example, because they have been bred into the opposite direction, to protect and not to fight, to bark and not to bite, which results in a very calm and gentle general behaviour.