@Foxfyre,
pit bull = loaded weapon in the wrong hands ...such as an untrained and unknowledgable owner/handler.
Please check out the 'Dog Whisperer' Cesar Milan for informative training and handling behavior info on Pit Bulls and all types of dogs and behavior issues.
Also if you look at the demographics of where and who are the majority that tends to buy these dogs...typical is an urban environment, densely populated, someone who wants security or the status of owning this 'fighting' type of dog.
All of these dynamics add up to an increased chance of an interaction that could be dangerous to another human or another dog. This is an aggressive dog whose mouth and jaws are designed and bred to inflict max damage...holding on with a bite force that is unmatched in canine world. When you couple that with an untrained handler, you have a deadly combination. Oddly, as a breed on the whole, they can be a loving sweet dog in the right situation.
Personally, I've been around big dogs such as Dobermans, German Shepherds, Mastiffs, Boxers and a few Pit Bulls, but only an aggresive Pit bull scares the crap out of me. I feel, though, when I was fearful it had more to do with the dog's handlers NOT being trained properly.