First, thanks for that fascinating essay on what is for humanity the most important topic there is.

While we humans are by nature social beings who live together in groups, we are by nature separate and independent beings with respect to one another. The existence of groups generates a need for governance, but that governance must also recognize our separateness and independence as individuals.

There is an ethic to govern governance that does follow from an observation within perceived material existence (so neither an immaterial belief, sacral/theological or secular/ideological, nor an arbitrarily conceived material circumstance, such as 'the prisoner's dilemma'): we humans have no choice but to effect choices (i.e., choose among perceived alternatives and take action to bring that choice to fruition). That makes choosing integral to being human, which gives us a material starting-point for an ethic to govern governance. It ends in an ethical place that can be called 'other-centered individualism'.

If curious for more, "Can't Get Any Simpler" is a "2 min. read" here in Medium (but not behind the paywall) with links to much more about that idea (none behind the paywall).