I just have a comment about such books, from any perspective.

99% of them will be read by people who basically agree with the sentiments espoused by the author. This is not the correct audience, though honing opinions is certainly a valid exercise. The people that should really be reading these books are the people that disagree with them. They need to understand how the other side thinks, whether that means coming up with legitimate rebuttals or being converted to a new way of thinking, not even necessarily parallel with the author's.

Now, many of these books are full of opinion and rhetoric and nothing else, but many contain real suggestions, theories, and otherwise active thought.

What we really need to do is figure out how to get each side to fully comprehend the stances of the other side (or sides) and not just continue preaching to the choir.

Sorry for the tangent.