Some of yall are dumb.
Golden Retrievers have been selectively BRED to work with humans and to RETRIEVE, Brad is right, they don't have the biting power that some dogs have, because hunters don't want them to destroy the bird they just shot. Look at the difference between their heads - a golden has a tapered snout, whereas a pitbull has a wide flat mouth - more lbs of pressure per square inch, anyone can see that.
People don't seem to understand the concept of dog breeding. Puppies have been selected that show certain characteristics that people want in a breed. The dogs can't help it, it's in their nature. Border collies who are 8 weeks old and barely running around will go after sheep and start herding. Retrievers will fetch EVERYTHING and bring it back to you. Pitbulls, rotweilers, dobermens, ect will protect their territory, because it's what they've been bred to do.
Any dog can be aggressive, that's true. But more than likely it's because of some fault from the human that raised him. However, it's MUCH easier to confuse a pitbull (or any other kind of semi-aggressive dog) into thinking that a person is another dog and/or make them think that any stranger on their property needs to be attacked.
Another thing is that people who own pits who don't take care of them and let them roam get into another sort of problem - territory. If the dog isn't contained his territory that he claims as his own may spread past his house and into the street, across into the neighbor's yard, etc. People can walk down the street unknowing that they're in his land. Someone won't walk into a fenced in yard with a dog in it, because they know it's his area.
Unfortunately, pits seem to get a lot of the blame, not only because of the breed's stigma, but because people who like to own pits for reasons other than the breed end up ruining it for people who truly enjoy the breed. You don't see golden retrievers chained under a car. Some people either see them as a second alarm system or an item that makes them more macho, tough, etc. It's very sad - but I'm sorry pitbull owners, yall have a lot of adversaries to overcome because of those people. Pitbulls in general are extremely sweet and affectionate to their owners, but they can be a liability if not raised right, JUST LIKE ANY OTHER AGGRESSIVE DOG, unfortunately the breed has been exploited for the characteristics that come naturally for the dog.