I think it comes down to individual dog personality and handling.
When Io and Circe were pups (family dogs who are dalmatians) the first dog they met was Lexi, a pitbull. She was the sweetest and friendliest dog you could ever meet. Her owner, Aaron, was great with her. She had been trained with a loving but firm hand. Aaron was always consistent with his rules, and I must say, she might be one of the most well-trained dogs that I ever met. (I can tell you that Io and Circe aren't that well-trained )
Because of their experience with Lexi, they just love pits. One day I was taking them to the Dog Run (it's a fenced in area that I think is about 5 acres where dogs can run off-leash), when I ran into a couple with three pits who were getting into their car in the parking lot. (Momma, Dad, and Baby pits.) I asked if Io and Circe could say hi (they were still small pups) and they said sure. Io and Circe were ecstatic and enthusiastically greeted the family. The couple then left with their dogs. A few days later, a friend of mine was in the Dog Run with her adult dalmatian, Cassidy. Cassidy was known for rough play, and began playing rough with one of the three pits I saw days earlier. The three dogs converged on Cassidy, and ripped open her side. The owners stood there as my friend managed to pull the dogs off. At this point, she was bitten, and the owners quickly retreated towards the entrance with their dogs. At this point, the adult female attacked another dog while the male dog attacked its owner. Someone with a cell phone called the cops, and the animals were taken to animal control. After a trial against the owners, the animals were PTS.
Why tell these stories? It shows how training can make a real difference in how dogs react to different situations. I agree with GoldenKitty45 that dog breeds were created with a purpose in mind, and it is up to the owner to know the breed of dog they adopt, and to appropriately train the dog accordingly. Oh, and if it is not clear, I do NOT believe that any breed can be painted with condemnation.
To add further, Io and Circe are dals who have never bitten anyone and love people. They were socialized with people and dogs from a young age, and I believe it has greatly helped both of them.