No, pit bulls are not aggressive by nature. Sometimes, if the people they live with aren’t good guardians and care for them properly, it’s possible for a dog to become aggressive.
The American Kennel Club has given this breed the highest rank of “Recognized (flat)” in terms of aggression and sporting qualities and points out that some emotional instability is seen in all breeds of dogs when isolated from their pack authority: humans. Non-canine scientists have also studied humane associations involving Pit Bulls where many if not all cases involve abuse or neglect on behalf of the owner…