I completely agree with what The Dean said. They were trying to pass a BSD a few years back here in Texas, and found that they had to throw out all data based upon attack reporting,b ecause people tended to always claim it was a pit bull attack, and never claim any other type of dog attacked (even though it was completely unrealistic).
Also, the American Temperment Study found that Pit bulls, on average, have a better temperament than Golden Retrievers.
The problem is, like any dog, one sthat have been badly socialized will have a hard time with humans. In addition, they are extremely powerful dogs, so they can do some damage.