Such a good message, a dog is a reflection of its owner. Any dog can be aggressive regardless of breed and any dog can be sweet, loving, caring and harmless including if not especially pitbulls. So remember judge the owner not the dog.
And everyone thinks pitbulls are bad because of their aggressive behavior when really it's not the behavior of the breed, it's how the leader taught and trained their dog to be. 100 years ago pit bulls were known as nanny dogs.
People always trend to judge things without ever knowing the facts. I've owned 4 pitbulls and numerous other dog breeds. By far my pits were the most docile and playful dogs I've ever known. NEVER judge anything based upon looks or speculations.