What’s confusing me is weren’t the options: a) stay and die b) get mithril stay and live c) go home? And wasn’t there some big to do about Galadriel “going home” in like episode 1? Or was that not the same place? Because in this scenario it seems like “go home” is a pretty clear winner if those are the same place.
The thing is, they're bathed in Silmaril light every night. (Assuming we buy the ridiculous premise, which is patently anti-canon) Earendil was put up in the sky as a star by the Valar with a Silmaril.
This plot makes as much sense as having Abraham Lincoln show up as a Cthulhu cultist.