Unfortunately, people who have absolutely no business owning dogs, let alone any kind of animal, end up choosing the Pit Bull. I take both of mine to the dog park, and I just sigh when I see the Pits with the stereotypical owners.....young adults acting "gangsta" and having the big-ass chain around their dog's neck. While a couple of these fellows are genuinely nice folks all around, the stereotype remains intact by their actions.
Pit Bulls are not inherently more aggressive and vicious than any other dog. Yes, they can be a bit animal aggressive, but have great temperement levels, especially towards people, moreso than most breeds.
Anyone who buys into and believes otherwise are oblivious to facts and need to visit the library more often rather than the dumbbox.