I'm a sociology nerd. If you want to understand how important sociology is, and how clearly it can be reasoned about, read Eric Hoffer. If you want to understand how important it is to understand how we evolved, read "Before the Dawn."

Also, I like to look at sociology as the study of complex systems - extremely complex systems. It is difficult to study systems over which you do not have complete experimental control, however it is possible to view history as a series of experiments.