I was listening to the radio and some doof veterinarian was talking about how he'd been bitten more by chihuahuas than pit bulls or rotweillers. Well, that may be true, but it ignores the amount of damage done by the attack. Unfortunately, there are a lot of people who raise pit bulls for fighting. One of the big reasons Humane Societies screen owners now is because the pit bull guys would come in and get dogs for their pit bulls to practice on.
Unfortunately, for probably the last twenty years, pit bulls have been bred to be aggressive and as such, I wouldn't own one. I've also known several pit bull owners, and most of them breed the dogs for fighting, and fight them.
You are a smart guy to know your own limitations and chosing not to owen a Pitt Bull. Many owners are not so savvy.
Having a dog that can really injure a person or another animal carries a burden of reponsibility and expertise. I admire the INuit for how they discharge that responsibility with dogs which are much more agressive and strong than Pitt Bulls ever will be.