The original report, which summarizes many other cited studies, is not difficult to find. From this report:
“In contrast to what has been reported in the news media, the data contained
within this report CANNOT be used to infer any breed-specific risk for dog
bite fatalities (e.g., neither pit bull-type dogs nor Rottweilers can be said to be
more “dangerous” than any other breed based on the contents of this report). To
obtain such risk information it would be necessary to know the numbers of each
breed currently residing in the United States. Such information is not available.”
From a different report by AMVA:
“Owners of pit bull-type dogs deal with a strong breed stigma, however controlled studies have not identified this breed group as disproportionately dangerous.”
The “strong breed stigma” is certainly not helped by the clickbait site @Dutchess_III linked to, which said about the breed:
“To anyone who knows dogs, the American Pit Bull Terrier is no surprise at #1 on a list of deadliest dogs. In this study the Pit Bull stood far ahead of all the other breeds with 66 fatalities attributed to it. Known for their extremely aggressive nature, many states have legislation banning the breeding of pit bulls.”
As the AMVA study points out, pit bulls are preferred by violent people because of their reputation. It’s literally a vicious cycle.