@dappled_leaves to address your comment ”I think that if you believe dogs can be “born vicious”, then you have to also think that children are capable of being “born vicious” or “born bad”. I don’t.
Both people and dogs can be born with aggressive tendencies. The problem with dogs with aggressive tendencies is they can just be mean. They don’t have many positive outlets for their aggression. They also don’t have the intelligence to analyze their aggression the way humans can.
On the other hand, humans with aggressive tendencies often they channel their aggression in other areas, such as sports, or Wall Street or other competition, and often become successful. Others go to bars, get drunk, and get into fights.
My husband is a pretty aggressive guy and he is a very successful salesman.