In the words of the author himself, a historian must be fair and respect the facts, but it can not be neutral because it has to choose whether to speak or not of a particular event (talk about anything is impossible), and because it inevitably chooses the way he speaks - in correspondence to a judgment on the events. Moreover, it is not necessarily desirable that historiography is amoral and apolitical: it is good to train our ethical and political awareness with regard to history.
However, this book is anything but a purely ideological work. It is remarkably well documented and well written, with a back-and-forth between constant history "large-scale" and scenes and testimonies that make it extremely vivid account.
I had always bored in history class at school. This book made me want to devour the history books. I do not recommend it enough!