[st d] Well done though.

Wow, this moves fast...
Raak] If by the case of Iraq you mean the resistance against the US/British occupation, then I'd agree that they are morally justified (without necessarily meaning that each and every one of the resitance's actions are morally justified). I suspect that's not what you mean though.
I think the core problem here is where you say "That is the key difference between empirical knowledge and moral knowledge: one is demonstrable and the other is not." If moral knowledge is not demonstrable in some way, then how do we learn it, other than by faith? And given that there are lots of possible belief systems, many of which disagree very strongly with each other, how do we distinguish between right and wrong belief systems?

Darren] I still don't see how you can know whether a proof is possible, without knowing how you are testing it.

[Irouléguy] I think we've moved slightly from rulesets to proofs... the thing is, I don't think you need to prove a mapping is anything other then a mapping. It could be totally arbitrary, with no proof possible, but as long as you had a consistent mapping from one category to another, or, as I said above, a subset of one to a subset of the other, then that's sufficient. A ruleset doesn't need to be grounded in the real world to be a ruleset. It can be entirely abstract, but as long as it doesn't contradict itself then that's good enough as far as the logical proposition is concerned.

[Irouléguy] Indeed it wasn't! This may be getting into the stuff of flame wars, but I had in mind (as you no doubt guessed) the removal of Saddam as the moral act, and cannot see any of the resistance "actions" (i.e. suicide bombing, suicide bombing, and suicide bombing) as moral acts, especially given that the resistance is coming from the Sunni minority whose goal is Islamic dictatorship. Which of their actions do you think are morally justified?
       How do we learn morality? Upbringing, practical experience, revelation, and reason applied to those. As someone once put it: "If you get it, it will be in spite of any method. You must have a method."

[Raak] Hm, I don't think I'll bother continuing with this. Nothing you've suggested as an example needs more explanation than simply that humans enact moral (and legal) consequences upon one another according to the collective effect of shared or accumulated beliefs. This is the main reason muggers (nowadays) can have little success (even ignoring the fact that poverty is probably as much a cause of mugging as vice versa). Sure, all this might be the manifestation of some deeper mechanism, but it could just as easily be a bottom-up emergent phenomenon (rab can correct my terminology if I'm using this expression wrongly) that arises out of our brain chemistry and its interactions with the environment etc. etc. From what we know, this seems to me the most conservative and most available explanation. Why invoke absolute good, absolute evil? It still seems to me that you might as well invoke God. Certainly the notion of absolute good and evil, once you start trying to define them to the letter (in the case of say, the actions of Iraq's invaders and Iraq's resistance), admit of as many conceptual problems as the notion of God. Unless you can tell us more about the reasons for your willingness to entertain your leap of faith (and you've said you can't), I feel we're really just pushing words around.