[stripes1776]

And at last Sam overcomes his fear and must throw the ring in the fire for Frodo who has succumbed to temptation after all his efforts to resist it.

No, that isn't correct. My memory failed me. It is Gollum who falls into the fire after biting off Frodo's finger with the ring still on it.

[Anitius Severinus Boethius]

Correct, it wasn’t anyone who decided to destroy evil, it was the hand of Providence that took action and finished the good works that Frodo and Sam had faithfully undertaken.