Oh, this all makes me want to crawl in a corner and cry for all the innocent dogs being stereotyped. I'm sorry, but it's just another stereotype that HOPEFULLY will be shattered soon, because if many people have their way, these beautiful breeds will become extinct.
Actually, pit bulls VERY rarely attack humans with the intent to kill. Some of them have very strong dominant traits, and if they see a human walking around that they perceive as weak, they try to dominate him/her. Even Cesar Milan's dog pack, which is famed for having so many rehabilitated aggressive dogs, will bite a person if they don't approach it correctly.
About the porcupine thing, why are you guys blaming the dog and acting like it's a character flaw of the dog? If that dog was a farm dog and trained to protect livestock or chickens, it was probably trained to kill any predators like raccoons, porcupines, oppossums, etc. Also, while porcupines usually don't attack bigger animals, if that particular porcupine was guarding its young, it doesn't matter if the dog just happened to be walking by, that porcupine will attack to kill. Too often people forget that animals live by their own rules, not ours. The first thing I thought when I saw that picture was "Oh my god, that poor dog!"
Also, I've been threatened with BSL, even though I don't own a pit. I own a purebred Neo, but she's going through a growth spurt and her wrinkles aren't as abundant, and one landlord thought she was a pit mix and threatened to call animal control on me. There are so many nice mix dogs out there that will be killed if BSL goes into effect.
As much as I love pit breeds, I myself never want to own one. I know that I'm not a strong enough owner to control their DOMINANCE issues. Everyone keeps saying they have aggression issues, but it really comes down to their DOMINANCE. With a good enough owner and trainer, they are great dogs.
I know that no amount of talking will convince people who are very strongly anti-pit, and that's what makes me sad. If we could just all recognize the REAL problem and issue, then maybe we could actually do something about it. But if us pro-pit people have to keep trying to convince anti-pit people not to go out there and kill all the pits, then we're never going to get anywhere.