David Mamet is somewhat less well known that John Maynard Keynes (I never heard of him, for example), but he is notable in that he is no longer a "brain dead liberal."
I took the liberal view for many decades, but I believe I have changed my mind.
As a child of the '60s, I accepted as an article of faith that government is corrupt, that business is exploitative, and that people are generally good at heart.
These cherished precepts had, over the years, become ingrained as increasingly impracticable prejudices. Why do I say impracticable? Because although I still held these beliefs, I no longer applied them in my life. How do I know? My wife informed me. We were riding along and listening to NPR. I felt my facial muscles tightening, and the words beginning to form in my mind: Shut the fuck up. "?" she prompted. And her terse, elegant summation, as always, awakened me to a deeper truth: I had been listening to NPR and reading various organs of national opinion for years, wonder and rage contending for pride of place. Further: I found I had been—rather charmingly, I thought—referring to myself for years as "a brain-dead liberal," and to NPR as "National Palestinian Radio."