I don't disagree with this, though as I've said multiple times upthread, it's not a playstyle that personally appeals to me.
That makes sense to me. I see alignment as a distinctly D&D thing, and when I'm not playing it, I don't want it. When I do use alignment, I also tend to do the "is Good actually good?" thing when I'm running the campaign.
The argument that I've been running, that (I think) you stepped into, is that it makes no sense both to run the game in the way you have just described - positing objective cosmological forces of good and evil - and to allow that it makes sense for a character in such a gameworld to deny that the demands of objective cosmological good are really good. If you are going to run an "objective cosmological forces" game, then it seems to me that everyone buys into that, and the characters within the gameworld, recognising that there exist these forces of objective cosmological good and evil, accept their judgements.
Yeah, you'd think that it'd go one way or the other. Either you play as I described my campaign (shades of grey within the alignment system... "is Good actually good?"), or you'd go for the more clear-cut, no-debate approach ("Good is good, and we all agreed to this definition"). It doesn't make much sense to mix the two. To me, at least. I can easily see running with the "shades of grey" style and having many characters (even PCs) that don't end up questioning things, but if you're going with the "no-debate" approach, then mixing them doesn't seem like it'd work out well.
So, basically, if you want to be able to debate real-world morality in the game, there's still not a problem with saying "these things are Good and these things are Evil", in my experience, because you can still ask "but what is right and what is wrong?" And while you may discover, in play, that Good isn't always right (from your character's perspective), the alignment system certainly doesn't discourage you from exploring those questions. Again, in my experience.
This is one of the reasons I asked you earlier in the thread to stop conflating the words "right" and "good", in this context they are not the same thing and I believe you are the only one using them in a manner where they do equate to synonyms.
This is something I could see being a problem. I'm definitely not using them in the same way here.
But, if I'm playing a LG character, paladin or not, why would I choose an action that is not Lawful or Good?
Because your character feels that it would be morally correct to perform that action.
Wouldn't that be out of character?
If the character has been trying to be as morally straight as possible (which usually makes him end up at Lawful Good), then I sincerely doubt that it'd be out of character to continue to act in such a way. I say this from extensive personal experience on the "shades of grey" alignment side, and two LG PCs regularly debating their actions (as well as many NPCs that fell into that category that I ran).
If I know that action X is judged as not LG, then how can it be the right thing to do for a LG character? Wouldn't the most palatable action for my character be the one that is most in line with my alignment?
It depends on how beholden to that alignment he is. If he's a Paladin, I could see him being such a zealot that he's not going to stray from the path of Lawful Good; his faith in its ideals could blind him to any considerations that it might not always be the morally right path.
If, however, the character is concerned about right and wrong first and foremost (and not about alignment), and their actions have landed them a Lawful Good alignment, then it'd seem awfully out of character to not take the hypothetical non-LG action, as long as they felt that it was the morally right thing to do.
In my mind, you are arguing that the character is incoherent.
I don't understand your thought process.
IOW, if I know, beyond a shadow of a doubt (because the DM has told me before I do it) that my action is out of line with my chosen alignment, why would I continue to pursue that action, knowing that I'm violating the consistency of my own character?
I think we might have different understandings of what "consistency of character" might mean. In my experience, nearly all PCs are driven by beliefs, and their actions based on these beliefs determine their alignments. Very few PCs are driven by a particular alignment itself.
So, for the overwhelming majority of PCs (in my experience), it's not contradictory at all to act on their beliefs. For the few PCs that are driven primarily by a particular alignment, it would be contrary to that PC's beliefs, and thus he wouldn't consider the action the "right thing to do", even if he might feel conflicted, since, in the end, that act would violate what he believes in most (the alignment he adheres to).
Does that make sense?