User blog comment:RHawk/Why does Frodo take credit for destroying the ring?/@comment-27683822-20160127011426

I've come to believe the reason for Tolkien concluding his story in this way is to illustrate, on a mythological rather than actual plane of the story, that the banishment of "evil" in the end is not a result of just heroism, but a natural cosmic consequence of madness. Madness as in the complete devotion to the gratification of desire and the wish for power: Gollum.

In the words of William Blake:

"The fool who persists in his folly, will become wise."

The natural cosmic consequence of complete devotion to harmony and unity is the eventual fall from grace and betrayal of oneness.