Culture profoundly alters human evolution, but not because culture is learned. Rather, culture entails a novel evolutionary tradeoff. Social learning allows human populations to accumulate reservoirs of adaptive information over many generations, leading to the cumulative cultural evolution of highly adaptive social institutions and technology. Because this process is much faster than genetic evolution, it allows human populations to evolve cultural adaptations to local environments, an ability that was a masterful adaptation to the chaotic, rapidly changing world of the Pleistocene. However, the same psychological mechanisms that create this benefit necessarily come with a built in cost. To get the benefits of social learning, humans have to be credulous, for the most part accepting the ways that they observe in their society as sensible and proper. Such credulity opens up human minds to the spread of maladaptive beliefs. Tinkering with human psychology can lessen this, but it cannot be eliminated without also losing the adaptive benefits of cumulative cultural evolution.
(Robert Boyd & Peter J Richerson, Culture, Adaptation & Innateness.)