This is a great article on Yahoo about pitbulls and their history. We have long blamed human beings for the issues we have with pitbulls today. Any puppy you take from scratch will still be incredibly sweet but if people keep breeding the most aggressive dogs and the ones that are the best able to fight (ie ones with strong jaws, no sensitivity in the skin, muscular, etc.) and then treat them horribly and make them fight, pitbulls do not stand a chance in society: http://news.yahoo.com/blogs/upshot/pit-bulls-surprising-past-nanny-dogs-195612543.html