I think SOME of the pit 'bull breeds' are majority of the problem, but not all of the breeds. When's the last time you heard of somebody killed by a Bull Terrier or a Miniature Bull Terrier? Both are considered "pit bulls' under my county's definition, and a death by either of them would be listed as a 'pit bull' death.
If Rottweilers are as bad as pit bulls, then by all means the public needs to know that.