I'm sure that little dogs bite quite a bit. Maybe even more. But I've never heard of anyone dying from an ankle bite.
Dog bites are a fact of life. They are rare when compared to the total number of dogs owned as pets. Fatal dog maulings are irreversable. Large breeds, particularly those who were originally bred to be aggressive, are responsible for the vast majority of fatal attacks. A very few breeds are responsible for almost every single deadly attack.
So the debate isn't about dog bites or which dogs bite more often, it is about death. Deadly attacks and horrible maulings that do not result in death by some miracle. The scars last forever.
Those kinds of animals are dangerous and should not be allowed to be kept any more than lions or the like.