How to ground normative reasoning? The issue at heart is the source of authority and legitimacy.
The four alternatives on offer from conceptual space are:
- Science
- Religion
- Nonsense
- TBD
Science, although descriptive and not normative in nature and argument, does have some fairly important contributions to make in the search for grounded reasoning. The first has already been mentioned; namely, that cause and effect provide a model for if-then logic. Further, the coherence, understandability, and predictability of the natural world, based as it is on the workings of consistent fundamentals, provides a model for how to build such systems; namely, via the use of universals and rule-based heuristics. Once again, science is along for the ride, but unfortunately cannot sit in the driver's seat and solve all our problems.
Religion is based on rules and precepts that explicitly do not rely on the natural world. It can also be observed that religion provides no universals in the way science might. That is, each faith may make such a claim, but the existence of competing faiths means there is no universal understanding, and the lack of testable hypotheses means there can be none, ever. Next, the contradictions inherent to any creed invalidate it as a model for coherent reasoning. Finally, the absolutism to which faiths adhere is a frank admission of failure, representing a reduction of argument to "jus' 'cuz". Nevertheless, insofar as religions do tend toward some form of understanding of right and wrong, they may inform normative reasoning by providing goals and behavioral guidelines which, if properly taken, can be used in secular fashion.
Nonsense is nonsense, yet it nevertheless often forms the basis for normative systems, such as monarchies and authoritarian governance by political extremes. Monarchy posits the impossible; namely, genetically-based wisdom, as do authoritarian regimes. In general terms, given the limitations inherent to any individual, personality cults in all their forms are a guarantee of systemic ignorance and brutal denial of logical alternatives in decision-making. This makes consistent, predictable outcomes in governance impossible.
TBD. So, what is left? Upon examination, we can observe that social convention -- implicit and explicit consensus -- is always at work, from the initial unstated rules of engagement that allowed savages to form towns and cities, to the formal deliberations of absolutists when choosing a leader, to the determination of which are the best-fit interpretations of data in science, to the slow workings of socially acceptable behavior in general. And, as we see, there are no viable alternatives to this approach; namely, that of developing a political
philosophy.
The task, therefore, in setting any policy or adopting any major system, is to identify the grounding universals that "if not true would break the system", as stated earlier about the laws of science. In arguing for a republic (representative democracy), for example, there are two essential statements, one the foundation, the other the caveat to ensure predictable and manageable outcomes. And they are?