So, it seems that in a system of all radically rational agents, ie give me freedom or give me death, fairness is an essential condition of its existence. If particular rational agents within a society feels that it is unfair to them, the available actions, to modern enlightened human being as agents, include opposing the unfair system. Ideally, a social system needs to have existential support from all constituents for it to be “universal.” If it’s constituents oppose it, it must not be universal. Non-universality of a system in this minimal way is sure sign of under-endowment as a virtuous and desirable system.
So, there. I now feel, after many years of wondering, that fairness must be a very important aspect of any pan-human endeavors, as a practical, spiritual and philosophical matter.