"pit bulls" have for a lonnnngggg time had violence bred into them. Sometimes it does not matter how they are raised, they can and will snap at the least provocation. I work for a sheriff's office that also does animal control and we are FOREVER getting calls about "pit bulls" that have gotten lose and have either chased children or other dogs for no apparent reason so I totallllly disgree about the whole nature or nurture question and would never own one nor and I would cross the street to avoid one, leashed or unleashed , no matter how nice it seems the owner is! Ok. getting off the soapbox now!