Okay seriously, pit bulls suck. But it's not their fault that they suck. They have been deliberately and effectively bred to attack and not to stop. Now, you can raise a dog not to attack, but breeding often wins out. I can try to train my beagle not to chase rabbits, or a chihuahua not to yap, or a greyhound not to run, but they will always revert back to breeding at some point or another. Pitbulls, when faced with anything they take to be aggression, want to attack it. They may resist the urge 99% of the time, but that 1% that they do give in can really hurt. And it's not their fault.
Pit Bull lovers are the ones at fault. When a baby has his testicles eaten, it's not the dog's fault, or even the mother who set the baby down asleep in his carrier. When a 3 day old baby lying on a bed is mauled and killed by the family pit bull, it's not the dog's fault. It's the people who say every day that owners, not breed, determine a dog's temperament. The people who convinced the parents that the kid was safe around the dog, that it was possible to predict the dog's behavior based on how you raised the dog, that pit bulls will not attack a creature prone to sudden movements and loud outbursts as long as it wasn't taught specifically to attack. It's the age-old nature vs nurture argument, and it has in many instances been disproved People used to think gender was all in how you were raised, but now they know it's inborn. And just like this, some day people will realize that some breeds of dogs are just more aggressive than others. And the stupidest part of it is, they already do!
The same person who swears their pet pit bull would never hurt a fly because they raised him nice are always quick to also point out that they'd trust their pit bull with a baby before they would a chihuahua because "little dogs bite more". So which is it, that breed means nothing or that it does? If chihuahuas are more quick to bite as a breed, then you're arguing against yourself. But even so, chihuahuas bite and then let go. Pit bulls hang on until they're dead, and they don't always let go even then. But it's not their fault. It's not a schizophrenic's fault when he kills someone he thinks is following him with a bomb. But if there were a large segment of the population out there claiming that unmedicated schizophrenics are safe as long as their parents raised them right, it would be those folks' fault when the hot dog stand guy gets jumped for waving a ketchup bottle.