Probably because they're focusing on the "dangerous" part. And not just number of bites. For an adult, a Chihuahua biting you is probably not as "dangerous" for your health as a Rottie or GSD biting you.
But I get your point. I've been bitten by many, many more small breed dogs than larger breeds (including the "dangerous" breeds).
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Karma v. Wildhaus, PSA1