#the letters of jrr tolkien
I dislike the use of ‘political’ in such a context; it seems to me false. It seems clear to me that Frodo’s duty was 'humane’ not political. He naturally thought first of the Shire, since his roots were there, but the quest had as its object not the preserving of this or that polity, such as the half republic half aristocracy of the Shire, but the liberation from an evil tyranny of all the 'humane’*–including those, such as 'easterlings’ and Haradrim, that were still servants of the tyranny.
Denethorwas tainted with mere politics: hence his failure, and his mistrust of Faramir. It had become for him a prime motive to preserve the polity of Gondor, as it was, against another potentate, who had made himself stronger and was to be feared and opposed for that reason rather than because he was ruthless and wicked. Denethor despised lesser men, and one may be sure did not distinguish between orcs and the allies of Mordor. If he had survived as victor, even without use of the Ring, he would have taken a long stride towards becoming himself a tyrant, and the terms and treatment he accorded to the deluded peoples of east and south would have been cruel and vengeful. He had become a 'political’ leader: sc. Gondor against the rest.
But that was not the policy or duty set out by the Council of Elrond. Only after hearing the debate and realizing the nature of the quest did Frodo accept the burden of his mission. Indeed the Elves destroyed their own polity in pursuit of a 'humane’ duty. This did not happen merely as an unfortunate damage of War; it was known by them to be an inevitable result of victory, which could in no way be advantageous to Elves. Elrond cannot be said to have a political duty or purpose.
* humane: this (being in a fairy-story) includes of course Elves, and indeed all 'speaking creatures’.
–J.R.R Tolkien, The Letters of J.R.R. Tolkien, #183
The sequel, The Lord of the Rings, much the largest, and I hope also in proportion the best, of the entire cycle, concludes the whole business – an attempt is made to include in it, and wind up, all the elements and motives of what has preceded: elves, dwarves, the Kings of Men, heroic ‘Homeric’ horsemen, orcs and demons, the terrors of the Ring-servants and Necromancy, and the vast horror of the Dark Throne, even in style it is to include the colloquialism and vulgarity of Hobbits, poetry and the highest style of prose. We are to see the overthrow of the last incarnation of Evil, the unmaking of the Ring, the final departure of the Elves, and the return in majesty of the true King, to take over the Dominion of Men, inheriting all that can be transmitted of Elfdom in his high marriage with Arwen daughter of Elrond, as well as the lineal royalty of Númenor. But as the earliest Tales are seen through Elvish eyes, as it were, this last great Tale, coming down from myth and legend to the earth, is seen mainly though the eyes of Hobbits: it thus becomes in fact anthropocentric. But through Hobbits, not Men so-called, because the last Tale is to exemplify most clearly a recurrent theme: the place in 'world polities’ of the unforeseen and unforeseeable acts of will, and deeds of virtue of the apparently small, ungreat, forgotten in the places of the Wise and Great (good as well as evil). A moral of the whole (after the primary symbolism of the Ring, as the will to mere power, seeking to make itself objective by physical force and mechanism, and so also inevitably by lies) is the obvious one that without the high and noble the simple and vulgar is utterly mean; and without the simple and ordinary the noble and heroic is meaningless.
–J.R.R. Tolkien, The Letters of J.R.R. Tolkien, #131. (Part of a letter intended to demonstrate that The Lord of the Ringsand The Silmarillion are interdependent and indivisible.)