It's not propaganda at all.
The book is written by a famous Hollywoodesque Liberal who has written several famous plays including some that have been adapted to the big screen.
He is brilliant, a bit pompous, brutally honest and unmistakably a former lib-- He examines aspects of American culture politics, psychology, current events and the like in a way that I have never considered before.
This is not your garden variety reformation story-- ala Andrew Britebart/ David Horowitz-- Mamet is far more profound.
Here is a brief passage I found particularly memorable about 10 pages in:
"I examined my Liberalism and found it like an addiction to roulette. Here, though the odds are plain, and the certainty of loss apparent to anyone with a knowledge of arithmetic, the addict, failing time and time again, is convinced he yet is graced with the power to contravene natural laws. The roulette addict, when he inevitably comes to grief, does not examine either the nature of roulette, or of his delusion, but retires to develop a new system, and to scheme for more funds. The great wickedness of Liberalism, I saw, was that those who devise the ever new State Utopias, whether crooks or fools, set out to bankrupt and restrict not themselves, but others."
