"Pit Bull" is no longer a relevance to a breed but is rather a type. Any dog that has a blocky head is considered a "pit bull" (especially in the media's eyes). I have a registered American Pit Bull Terrier and I can't tell you how many people think she is a mix, or a pup, because she does not have a massive head and weighs 45 pounds. Unfortunately the general public cannot even seem to recognize a real APBT and the "pit bull" is known for being 80+ lbs monsters with giant noggins, wide barrels, straight shoulders, and posty hinds... when in reality an APBT should be nothing of the sort. The sad reality is that all of these "attacks" by pit bulls are a combination of backyard breeding, irresponsible owners, and the population as a whole being generally ignorant to the point where they have no clue what they are even looking at.
If you choose to own this breed, dog aggression is just something you have to be informed about and be prepared to manage it. Socialization is the basis for any dogs upbringing, but no matter how much you do expose your APBT to other dogs it in no way guarantees safety. My dog is very well behaved with others but I always keep a close watch on her, because while I trust her not to start anything I do NOT trust other peoples dogs, and I do know that she would finish any sort of altercation. Unfortunately in any sort of issue with a APBT involved, they will undoubtedly receive the blame... whether its warranted, and in many cases, when its not.
Having a APBT is different from any other breed of dog. It is not for everyone. Besides the dog aggression tendencies, APBT are extremely athletic and need an outlet. You will also find yourself many times on the defending end against the uninformed (and opinionated) types. That being said, I always have an APBT. I love all dogs, but this one is the one for me.