OK I see some things wrong there..

If the animal was used in dog fighting, YES it will be aggressive, heck you want agressive, get a poodle (not the miniture type you guys think of..the real poodle, the one that's abput the height of a lab).

As far as bad breeding, those breeders need jail time. Breeding is a massive responsibility, and in any purebred, documents MUST be kept and protected. Yorkies have it far worse than Pits in this category...I've seen some outright deformed Yorkies, most saddening was one that didn't have the strength in it's rear legs to walk right....the owner thought it was cute....I wanted to set HER on fire for being that mean...cute or not, that poor dog was suffering.

Again key to owning a Pitbull is proper treatment....Terriers are to be treated totally different from other dogs due to their unique bahavior traits. Pretty much you have incompetant owners and shady breeders to blame.

As far as experience, I've seen a good many pitbulls there were absolute sweethearts. Actually the only dog I ever truly had an issue with was a Mastiff....but that dog also happened to be mistreated badly by it's owners. Once I got proof of the mistreatment, I got the authorities involved...they were beating that poor dog with a baseball bat

....of course they always said they were nice to the dog.