And prefaces are not content. One can agree with the preface and not the body of the argument.

I'm not going to argue. I give up. Logically the preface is part of the rest of the text. Problem is, there is no rest of the text. But I guess that doesn't matter. If the preface is supposed to lead to a political discussion, even if the preface is non-political, that makes the entire preface political.

I just wish I had such keen eyes. Without the author's last graph, who could have known the rest of his text was so political in nature?