Hmm, I actually read a lot of Tolkien a while back, and while I'm aware of his views on the industrial revolution and the wild goose chase of human "progress" (and agree to a limited extent, but it's a lot more complicated than any of the cultural zeitgeist, unfortunately), I think you missed the bit where his dark-lord-opposing heroes ultimately are supposed to answer to some ancient ideal of some theoretically (if not always practically) lawful kingdom that was eventually derived from the forces of good sent to create the world in the first place, or something along those lines, in the whole attempt to see things as allegory for the culture in which they were created. Tolkien himself had people at the time saying it was an allegory for the World Wars and nuclear weaponry, which makes less sense than your own take, and he got pretty fed up with it and basically said he tried to write a story that was good in itself and had truths in it that applied to real life, not a story that was an imitation or allegory of anything. Granted, you're allowed to disagree with him if you want to; an author's not necessarily the be-all-end-all of his own work; but I do think Numenor and the exact nature of the old ideals Tolkien's heroes look back to does make the picture a little bigger. I also kinda liked the notion of the alignment chart precisely because it didn't have to be tied down to a cultural preference for associating chaotic and lawful with good and evil or the other way around, you're free to fill in all nine combinations; I could probably come up with examples of all nine in Tolkien if I thought back on it for a little while (it's been years since I actually read any of his work, though I was a fan I guess -- still kinda am in theory).
Well, Ring of Nibelung was much more clear on it, because it was written specifically to be an allegory.
LotR had more conflicting views on the subject because it was more influenced by Ring of Nibelung and Tolkien's personal wrestling with the likes of World War 2, rather than a cut-and-dry specific message that he was trying ot get across. The only major clear story points I at least never have seen in any real dispute are that it's a Hero's Journey story about a Cosmic War between Good and Evil.
One of the things I've really come to realize over the course of numerous arguments over this silly alignment grid is that it should probably have more dimensions than it actually has. Chaos can mean general dynamism - that is, hopefulness for the future, as opposed to living purely for the present. Hence, not to get political, but something like "positive change for our country" as a generic slogan appeals to one aspect of what Chaos can mean. It also often refers to a sort of divide between the ethnic and artistic cultural types or freespirited bohemian class as opposed to the more straight-laced blue collars and suits, as in
City Life. It
also refers to the general outlook towards society, and whether one is individualistic or conformist by general nature, and how much they try to blend in with or conflict with society at large. It also appeals to a political tendency of (civil) libertarianism versus strong government intervention and control. It is used in the allegory I mentioned before about the dualism between nature (or perhaps more modernly, environmentalism) and industrial development. (Fey creatures are chaotic, steampunk creatures are lawful.) It also gets used in terms of general literal "lawfullness" in the sense that chaotic characters are more expected to be thieves or literal law-breakers. Finally, it gets used in that Zoroasteric sense of a cosmic war between forces of a static, unchanging timeless universe versus total entropic decay.
I remember once having a very difficult argument with someone about whether "Chaotic Good was capable of being as good as Lawful Good" with someone where it came down to an argument about whether Martin Luther King Jr. was Chaotic Good or not. The other person was arguing that since MLK was not an actual thief (even though he not only directly confronted society and the laws of the land, but actually went to prison for it, only
stealing counts as chaotic, apparently), he must be Lawful, completely refusing to accept almost any of those other measures of "Chaos".
The reason so many arguments pop up over alignment is that the terms "Law" and "Chaos" are entirely overloaded. Whereas you can argue about what is good, (
Deontology versus
Consequentialism, round 12481, FIGHT!) people are really much less confused about what the notion of good actually is, and it rarely comes up in so much direct conflict with itself.
What about people who are conformist to their own small sub-society's views, but where, because they are a minority, they are viewed as radical, and discrimination has instilled in them a deep sense of a grudge against authority outside their cliques? D&D alignment basically just throws up its hands in those situations, and says that's "Neutral". The problem is, almost nobody will actually fall into every single one of those dualisms purely on one side straight down the line. If nearly everyone is neutral, the whole basis of judgment loses all meaning except on those few extremist outliers.