What WotC does with their property is obviously their prerogative. I think DL has some cool tropes - including the eponymous dragon lances! - but for my RPGing purposes it doesn't offer me anything I don't get from JRRT/LotR.@Permeton - I do truly appreciate what you're trying to do here, but, I'd point something out. Nothing you've brought up hasn't already been brought up in this thread at least once. Genre convention, obvious parallels to religious and mythological stories, doesn't matter. You will not convince anyone here because they absolutely will not allow even the notion that it's possible to play in a game where the morality does not 100% fall in line with their own beliefs.
So, instead of trying to convince them of anything, we need to allow them to put forward a version of the Cataclysm that they find acceptable and work forward from there. Because, what you're doing here? This is just banging your head agsinst the wall. It absolutely will not go anywhere. Pointing to the text means that you're gatekeeping. Genre conventions don't matter. Actual real work parallels are unimportant. You absolutely cannot make any forward progress here. We really need to just agree to disagree and move on.
I just think it's bizarre to insist that romantic fantasy, based on incredibly well-known motifs from literary, folk and religious stories, abandon those motifs. There are plenty of modernist fantasy worlds - I've mentioned REH and Moorcock, and there must be plenty of others (I don't know the genre that well - perhaps Vance, though, from the classics?).
And I also think the inconsistencies are bizarre. The idea of paladin monarchs is rife in D&D worlds, just as its found in Arthurian stories, in LotR, in Earthsea, even in one of REH's Conan stories (the Hour of the Dragon). This requires just as much suspension of modernist moral belief as the Cataclysm does.
Did all these people boycott the Return of the King film (which asserts, without equivocation, the moral equivalence of rightful inheritance and good government)? Are they refusing to watch Rings of Power (set during the Second Age, which is the story of the downfall of Numenor for its sin of bride, frankly indistinguishable from the Cataclysm)? Do they all refuse to play the One Ring RPG or its 5e versions?
This is why, to me, this whole discussion really makes no sense.
There's a sense in which (1) is true: what mortal can fully understand the workings of the Law of Consequence?1. The reason for the Cataclysm is unknown. There might be stories, but, ultimately, no one knows and it is up to individual tables to decide. Personally, I favor this one the most. Simple, easy to do and no one gets to get all shouty that someone is doing it wrong.
2. The Kingpriest did it. Also not a bad one. The gods tried to stop it, but failed, and ultimately it's the Kingpriest's fault.
As far as (2) is concerned, we change the whole thing from a story about the sin of pride, to a story about what? What's the Kingpriest's motive? Why does he want to kill himself and destroy his land and people?
As I said, it's just bizarre.