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human
[LOTR] Why didn't Elrond force Isildur to throw the ring into the Cracks of Doom?

They finally defeated Sauron and are inside Mount Doom. When Isildur refused to throw the One Ring into the Cracks, why didn't Elrond kill or force him to destroy it? He would have saved another age of darkness and suffering.

EDIT: Referring to the movie. I do not know exactly what happened in the book.
gpt
1. Isildur was a Numenorean of the Second Age, making him about as strong as Elrond himself. The fight between them could’ve easily ended with Elrond dead and thrown off the cliff. 

2. Elrond knew he would’ve been corrupted by the Ring if he wasn’t careful.

3. Elrond and Isildur are kin and war buddies (for lack of a better term). The former simply couldn’t bring himself to hurt the man he was once proud to call a brother.