Pits weren't bred to fight at all. They were originally bred to hunt wild boar, if I'm not mistaken. THUGS have now unfortunantly begun to breed them to fight each other. It was not their breeding to begin with.
Actually, I have seen more labs who bite than pits. It's just the image that the thugs have now given a once nice breed.
I have always wondered though, why do "thugs" (of any race) are usually seen with a dog like a pitbull? I've never seen anyone in Los Angeles that fits the "gangster swag blah blah" description with a Dachshund or a Tibetan Spaniel. Tibetan Spaniels are so cute by the way n.n
Pitbulls aren't mean if raised right. Wanna know a mean breed of dog? Jindos, from my own experience I have to vote for jindos. Raising a jindo with love and respect will make it a great companion, but strangers should beware. I remember I was at a woman's house with my mom for dinner (when I was young) and she had 3 jindos, I thought they were like any other dogs so I made noises and clapped, they growled, chased me back into the house and I cried. They're also difficult dogs http://www.dogbreedinfo.com/jindo.htm I do think they are pretty looking dogs though.