Take a drive to the nearest ghetto and see what dogs they own. Pitbulls became a status symbol for them in the 1970s, and remain that. The more people-aggressive, the higher the status, so they use time-proven methods for making sure their Pitbulls are people-aggressive, which is what's behind the stats you cite. When they were not hugely in the hands of these sorts, prior to the 1970s, you never heard of a Pitbull biting anyone. They didn't make any of the "dogs that bite" lists. They were considered symbols of American patriotism and great kids dogs. Readers directed at children often featured drawings of kids playing with a Pitbull. The Little Rascals dog was a Pitbull.

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