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Actually, one of the biggest over-breeders of Labs and Goldens is Guide Dogs for the blind; get long-time puppy raisers together and in an unbuttoned frame of mind and all of them can tell horror stories about pups which are untrainable for some reason, including rage- not to mention congenital skeletal problems that make it impossible for some of them (and not a small "some") to wear a guide harness.
And the most agressive and bite-prone dogs I've been around have been Chesepeake Bay Retrievers (two of them, unrelated, from different breeders), a breed which is neither overbred nor one with any artificial popularity. Well, except for a nighmarish seven-pound rat terrier that Dad took in trade for a half-cord of wood once, who killed every cat in the neighborhood and a six month old Suffolk lamb before Dad could catch him and send him to his logical consequences.