Fighting breeds have been bred to fight. One method used by breeders is to take a litter of puppies and take them into a different room from a human. If a puppy goes back to the human they are put down. Multiple generations are processed this way. You wind up with dogs that fear humans. Of those that survived, the biggest and angriest get to breed. Over time you get a pretty dangerous dog. This doesn't make them a fighter, they do other things for that, but you still have a potentially dangerous dog.
Under 200 generations of humans since the pyramids, thousands for the dog breeds we see today, mainly due to humans creating breeds with specific purposes. There are new breeds popping up all the time. To say that a certain breed doesn't have the potential to do exactly what it was designed to do is silly...these things are very hard to train a dog not to do.
Besides pitbulls, there are several other very dangerous breeds. Any dog can be dangerous though, especially to kids.
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