Pit Bulls are not typically vicious towards humans. However, they may become aggressive in certain situations, such as if they were guarding a large piece of food against their owner who is trying to take it away from them.
It’s common for people to be threatened by animals in the same way that these animals have been threatened themselves. Dogs who were abandoned in a shelter or chained up in a yard with no attention will often react aggressively in order to protect themselves when their territory becomes invaded…