This contribution has two main goals which might be labelled for convenience as a pars construens and pars denstruens reversing the usual order of these terms. The first aim is to offer an overview of the main tenets of the book, while the second aim is to raise some critical concerns while remaining sympathetic to the author’s overall project. With regard to the first point, I present the context of intellectual debate where Buchanan’s contribution fits comfortably: Darwin’s evolutionary theory, anthropology, psychology, moral analysis etc. The target here is to show the internal complexity and different layers of analysis of the book. These initial reconstructions are, next, used to formulate some thoughts on what I consider possible problematic points in need of clarification. In particular, first, I hold that Buchanan presents too narrow oppositional views between intergroup relations whereupon the notion of “tribalism” is constructed. Such strong identitarian conception does not seem to depict adequately the sociological dynamics of intergroup relations. Second, I consider the terms in which it can be addressed the notion of the rise of the moral mind in evolutionary terms. The suggestion is to consider in a milder form the author’s key concept of a “Great Uncoupling” for the moral reason.