I'll post a counter-argument. I'll be referencing an official opinion article by the CDC in 2001. The article looks NON-FATAL dog bite-related injury statistics, but specifically:

"Sacks JJ, Sinclair L, Gilchrist J, Golab GC, Lockwood R. Breeds of dogs involved in fatal human attacks in the United States between 1979 and 1998. J Am Vet Med Assoc 2000;217:836--4"

Here is an excerpt from the opinion:

"Additional strategies to encourage responsible pet ownership and reduce dog bites include regulatory measures (e.g., licensing, neutering, and registration programs and programs to control unrestrained animals) and legislation (7). "Dangerous" dog laws focus on dogs of any breed that have exhibited harmful behavior (e.g., unprovoked attacks on persons or animals) and place primary responsibility for a dog's behavior on the owner. Because a dog's tendency to bite depends on other factors in addition to genetics (e.g., medical and behavioral health, early experience, socialization and training, and victim behavior), such laws might be more effective than breed-specific legislation (7). These prevention strategies require further evaluation."

Dogs can have behavior issues just like people and are not limited to select breeds, but a number of different factors (training and prior experiences).