What is the author's style in Slouching Toward Bethlehem by Joan Didion?

Didion's perspective is that of an observer of human nature. Many of the essays in this novel are the result of either interviews Didion has conducted with her subjects or simply observations of people in general. One of these essays is about a woman who has been accused of murder and Didion's observation that it was the expectations of being a California wife striving for the American Dream that made her do it.