If you're convinced that Pit Bulls are killers, take a look at this video update on a rescued Vick dog.
Can Pit Bulls kill? Of course. A chihuahua can kill, a Doberman can kill, a Labrador can kill. If it's got teeth, it can do damage. But the term "pit bull" doesn't automatically mean Killer. Just take a look at the video and accompanying story and you'll see the good will that Pits can bring — with the right training and the right owner.
The picture of the Pittie above is one I took of a handsome clown I met at a Super Pet Expo in New Jersey two years ago. He was surrounded by other dogs, and was cool, calm, and collected, despite the chaos that can be a part of pet expos. There were thousands of people there, every other person had a dog, and when I took this picture, the dog and his owner were backed up against an area where a donkey and a burro were being displayed! I didn't phase him – with my camera in his face, nor did the braying of the equines behind him. He was a real trooper.