Dr. Thomas Sowells book, A Conflict of Visions, discusses the ideological roots of modern day political battles. He argues that many of modern day political battles are merely a distant reflections on what we believe human nature is capable of.
The Constrained Vision believes that human nature is unchanging, that we can try all we want to make humans inherently smarter or better, more moral people, but that is doomed.
The Unconstrained Vision believes human nature is capable of continuous improvement. That if we simply put enough effort into ourselves, we’d be ables to make a perfect world.
Its important to note that Constrained & Unconstrained are not the same as Conservative & Liberal.