system
Given the following post, respond as if you're commenting on Reddit:
human
[LoTR] When Elrond tells Isildur to cast the One Ring into the fires of Mnt. Doom, and Isildur refuses, was Elrond not morally bound to kill Isildur? Is he not singly responsible for Sauron's return?

I refer mainly to the movies here, but perhaps the same thing happens in the books.

The scene I refers to happens in the middle of *The Fellowship of the Ring,* (extended edition DVD: 1:31:45), when Lord Elrond tells Gandalf that he witnesses Isildur standing over the fires of Mnt. Doom. Elrond says: "I led Isildur into the heart of Mount Doom, where the ring was forged, the one place where it could be destroyed..."

"Cast it into the fire! Destroy it!"

"No."

"It should've ended that day, but evil was allowed to endure."

He makes it sound like he was helpless to stop this, like it was out of his hands...yet in that one moment was he not obligated to attack Isildur and take the ring by force? Even if he wasn't able to foresee everything that'd happen, he knew the ring was treacherous and would inevitably be wielded by men to great evil.
gpt
I think that Tolkien said that no one could willingly drop the one ring into the fires of Mount Doom. Since the Valar certainly couldn't be arsed, that means than nothing on Arda could willingly drop the ring. No man, no elf, no hobbit, no dragon, no ent, no Balrog. That means that Elrond simply couldn't dropkick/push Isildur, as that would be the same as dropping the ring. Smeagol fell into the fires of Mount Doom fighting with Frodo (and Sam) trying to keep the ring, and then he fell, which means that he didn't intentionally do it.