I've just been reading a few articles about dangerous dogs. Here's what I read.
Humans make decisions for themselves, we're not born and instantly it's in our nature to attack. Where as these vicious dogs, it's their nature and they can't differentiate between what's right and what's wrong. Where as a human can.
Oh and @
Richie; I can't believe how much you're contradicting yourself, I actually can't. You're saying every dog has the potential to be trained clearly yours didn't or you wouldn't have given it away.