I grew up around the corner from a guy who had a viscious black lab, my neighbour had to take a baseball bat to school because of it, and he even hit it in the head at one point. Any animal can be vicious. Its just pitbulls have large strong mouths. Thats why they are trained to be violent, and because of this fact stats are skewed.

Now show me a statistic of bites from pitbulls when raised fron pups vs adopted