system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why did everyone just allow Isuldur to walk out of Mt. Doom and keep the ring instead of forcing him to destroy it?
gpt
[Doylist preamble: Keeping in mind that this is only a problem in the films as they never went into the Chamber of Fire in the book,]

“Force” him how, exactly?

Push him in? The presumptive leader of the army of Men present whose father and brother already died in this war? Already a survivor of the destruction of his birthplace due in no small part to Sauron’s machinations? The (many times removed) nephew of the highest ranking Elf present? How is that going to go down?

Take it from him by force? What makes you think that whoever takes it from him would be able to destroy it either? How well do you think someone who the Ring’s got its hooks into would take that?

The only one who saw him take the Ring is Elrond, his uncle mentioned previously [and Círdan the shipwright in the book]. There really wasn’t much of an “everyone” to get involved in the first place.