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I like how some of Finwë’s kids possess a gram or two of chill (Finarfin got his as a wedding present) but his grandchildren are all 0 chill nightmare children, all 14+ of them. One or two are chill-passing, The Arafinweans, Turgon, and Maedhros can appear to be grownups in the right light, but then you back them into a corner and it’s Kinslaying, Werewolf Biting, Standing At The Top Of Your Tower As The City Falls time. Even Galadriel mostly manages to be self-aware about her tragic case of congenital Shakespeare villianitis. Her greatest achievement is pulling back from the brink of bad choice central.
The Sindar in particular seem to fall into the narrative trap of, “well Fëanor’s boys are horrible demons but their cousins are surely fine,” and then, whoops, the crazy was right next to them the whole time! Just waiting for a dumb stunt to pull! You can’t escape the belated curse that Finwë’s insatiable lust called down. It just took a generation or so to really kick in.