There is a difference between an historian and an entertainer. The "expose" and "tell all" books are meant to titillate the National Enquirer fans to read something that costs more and uses bigger words (sometimes!) than supermarket-checkout tabloids.

Whether the book is for-or-against either candidate is immaterial. The goal of the book is not to enlighten the reader, but provide royalties to the author and profits to the publisher. If they could figure out how to get away with a centerfold in the book as well, on the concept that it would increase sales, that would happen, too.

It's amazing how many of these gems come out just before an election....