I don't feel safe with any dogs but if I had a choice I'd rather have one that has a weak bite and wasn't bred to fight and kill than one with increased jaw strength that has been bred for the purpose of being vicious (and is often kept by aggressive people as a status symbol and tool of intimidation and for use in dog fights). I agree that the owner has a huge responsibility too but it's like choosing to have a bear as a pet instead of a hamster, even if the owner treats the hamster badly and it gets vicious it can't do as much harm as the bear that only has to snap once and it can kill.