You might come back with the argument that the fact people get away with breaking moral rules is irrelevant to the truth of those rules, but if so then the truth of those rules is irrelevant to us if we are searching for objective standards, since the rules cannot be shown to have reliable consequences, and therefore do not admit of predictions.
I also think that rational suicide is a very interesting example in the objective/subjective debate, because it's always struck me as a very interesting example of higher-order thinking successfully overruling all the lower-order evolutionary thinking with which we come pre-installed. If our sense of objective morality rests on self-preservation, why would it admit of contradiction in this way?
Raak] (Following on from Breadmaster's reply) It's also the case that all of these moral traditions arose in societies whose rulers did not follow them, yet all of these moral traditions preached acceptance of those rulers. "Thou shalt not kill" actually become "Thou shalt not kill unless thou art the state". If these are absolute moralities, shouldn't the rulers obey them? And if the rulers are immoral, shouldn't the moral organise to get rid of them and impose the rule of the moral? My second objection is that I don't see what makes these an objective rule-set, as opposed to the many other moral precepts you could have instead (for example, sexual equality, environmentalism). Lastly, illustrating Projoy's point, I'm reminded by the weather of the Belloc (?) poem: The rain it falleth on the just And on the unjust fella But more upon the just, because The unjust stole the just's umbrella One of the lessons of experience (both direct and indirect) is that crime or acting immorally very often does pay.
Darren] You're right to pick me up on the creationist implication of my argument (not at all what I think). I was with your argument all the way until "In other words, we don't need a rule-set, because the proposition itself, if true, implies the existence of one." I think that's circular reasoning, because the truth or otherwise of a proposition can only be tested by reference to a rule-set.
[Irouléguy] Not circular, but certainly flawed. We don't need, and nor can we infer the existence of, a universal rule-set, however we do need a rule-set which covers at least the special case(s) covered by the proposition we know to be true in order to test it, as you say, but we can say (and this is what I was getting at) that if the proposition is true, then such a special-case rule-set must exist, even if its only rule is the true proposition itself. Bringing in the special-case rule-sets, a proof that there is no universal rule-set doesn't discount the possibility of a special-case one which covers only finitely many possibilities, and therefore it is possible for a proposition to be demonstratively true or false even if there is no universal rule-set.
(Er... by that I mean the focus of what I'm talking about has shifted away from morality into how logical propositions [can] be members of larger sets of rules mapping one class of items to another.)