Worthwhile article that examines the nature of knowledge in the social sciences as well as its limitations caused by human limitations and the structure of our institutions that produce knowledge.
If moral arguments for equality or against corporal discipline are constructed on a foundation of faulty science, then the foundations of that morality collapse as the faults are exposed. It is far safer to ensure that moral arguments remain independent of scientific claims—to argue, for instance, that gender equality is a moral imperative irrespective of whether or not gender differences are biological, or that hitting children is wrong irrespective of whether it leads to negative outcomes for the child.
Interestingly, here is another post from the same publication coming to the opposite conclusion about spanking which also speaks to the nature of the production of knowledge in the human sciences