—It certainly causes the view to be of dubious value.—
How so? It’s a moral view!
—Holding onto an irrational opinion in the face of superior justification for an alternative opinion is a case of communicating in bad faith.—
What superior justification are you offering that doesn’t simply beg your own moral opinion into play?
—How/why are moral debates different from any other kind of debate? You’ll have to back that claim up in order for me to accept it or consider it.—
How were you planning to “back up” a claim that rests on moral value?
—I can assume all I want, but how do I know, how can I justify my position? If I don’t know/can’t justify that my morals are superior (or equivalent) to everybody else’s, then how do I know that I’m behaving morally?—
What a good question!
—It comes down to rationality—
What a useless answer! Look: what is rational or irrational about values?
—The first of the a priori assumptions is only valid when accompanied by the a priori assumption that I’m some kind of infallible deity-like creature (because otherwise, by extending this assumption to cover all people, the first assumption becomes equivalent to the second assumption).—
Why would an infalliable deity-like creature necessarily have a “correct” moral view? And don’t tell me it’s because it’s infalliable: that’s in some ways like saying I’m an infalliable chooser of my favorite color.
—The second of the a priori assumptions is false in that objectivity is possible in man-made terms (otherwise the terms would have been rendered meaningless long ago and dropped from the language).—
Nonsense: plenty of people think that objective morality is a non-cognitive concept: but just because something is poorly thought out is no guarantee that it’ll be dropped from language, especially when it is so central to many people’s beliefs.
—Like I said above, you’ve got to justify your claim that moral debates (and terms) are somehow different from all other debates (and man-made terms).—
It’s pretty simple: because there is no way to demonstrate that my moral view is correct (or that yours is wrong). We can only do something like that by begginging the question. We can all agree what “good basketball playing is.” But if we can’t all agree on what is “good,” how can we measure it?
—Self-serving is not a meaningless term that can be applied at whim.—
It’s application here seems to be… ahem… a little self-serving.
—It means “Serving one’s own interests, especially without concern for the needs or interests of others.” “It is moral for me to murder because I want to murder” is a self-serving moral system.—
It might be: so? Why does that make it false? The person who’s wants are moral isn’t necessarily the reason they are so. That god’s will is morally absolute is pretty self-serving to god… but that doesn’t prove that god’s will is morally absolute. This, again, is your own random, unjustified opinion: that moral principles which seem self-serving to you just can’t be the legitimately true moral principles.
—Similarly, you don’t have to determine the morality of all actions prior to assigning the terms righteous/wicked to actions. They’re units of measurement, nothing more.—
Yes, but units of measurement based on some pre-conception of what is right and wrong. You can’t have it both ways. You can’t both use them in an objective, already defined sense, AND assert that they in any way help prove your case.