"Everyone knows the social sciences are fuzzy. Economists, political scientists, and anthropologists bring their moralistic baggage into the ivory tower as soon as they decide what to study and what not to. Social science is value-laden. But there is baggage and then there is a naked agenda. In the first case you might be a victim of selection bias or other unconscious human processes that skew your data. In the latter case you start with a political agenda along with its (often dubious) premises."
Article from the Freeman.