The films were as perfectly cast as possible, and the elves were portrayed perfectly too. You definitely got the feeling that they all were immortal, ancient, and dripping with the arrogance and composure that would bring.
Backup backup backup! If you have btrfs them just take a snapshot first: instantly.
One could do a non-destructive rename first. E.g. prepend deleteme. to the file name, sanity check it, then ‘rollback’ by renaming back without the prefix or commit and delete anything with the prefix.
Among my favourite takes on the Culture is, I think, from Consider Phlebas: that the Minds basically keep humanity as pets, and everyone is just fine with that thank you very much.
I got as far as using fdupe to identify duplicates and delete the extras. It was slow.
Thinking about some of the other comments… If you use a tool to create hardlinks first, then one could then traverse the entire tree and deleting a file if it has more than one hardlink. The two phases could be done piecemeal and are cancelable and restartable.