What struck me about book 1, which I've just finished, was how haunted the landscape was. Outside of Bree and the Old Forest, the hobbits and strider are wandering through a landscape filled with ruin fortresses and ancient tombs, and we get snippets of an ancient war. The struggle between the men of Carn Dum, who fell under the power of Angmar and its Dark Lord, and the men of the Northern kingdom, who left behind the barrows. The barrow-wights who despise the living reach out to grab them; the old stories and poems of ancient times keep them company.
The tragedy of Tinuviel comes out of an even earlier era, with an earlier Dark Lord, and so on. We hear also of an elf named Gil-Galad, with a star on his brow, whose journey into Mordor seems to be an echo of Frodo's. But his story is evidently not a happy one, though there are not yet any details. Between these two stories, we anticipate the journeys of both Frodo (towards doom, and Mordor) and Aragorn (in pursuit of an elf-woman who would choose death for him.)
The group moves across history, starting with the primeval old forest and its master, who may be the first being ever to exist. Tom Bombadil has power over anything younger than him, within his domain, and everything is younger than him. His only match is his rival, Old Man Willow, with whom he has butted heads throughout the ages. It seems almost to be a miniature form of the overall conflict of the story, with Old Man Willow standing in for the various dark lords.
There is a cyclical conflict embedded in the framework of Middle Earth, a seemingly endless confrontation between the acquisitive and power-hungry dark lords, and various groups of people who simply want to be left in peace. This is in line with what I know of Tolkien's anti-statist disposition (an unsurprising perspective, when held by one whose defining experience of state action was fighting in WWI). It is also consistent with the attitude of the books that draws from old germanic literature, which describes a world of doom, without any hope of salvation.
Indeed salvation, in the form of escape, is something the text holds in deep mistrust. Because this is the power of the ring: to escape your circumstances. Instead of rising to meet the way things are, or enduring through the pain that life gives you, the ring tempts escape from all that. Simply vanish and get away - you don't have to feel the pain life has in store for you. Bilbo puts it on to avoid running into the irritating Sackville-Bagginses. Smeagol puts it on to avoid the censure of his family. Both end up leaving society behind entirely, unable to participate in it do to their long avoidance of it.
Escapism, the promise of salvation from the doom of the world, is thus rendered the fundamental evil that must be fought against. Frodo is tempted, in the lair of the Barrow-Wights, to put it on and escape, and leave his friends to die. But he does not. It is Frodo's ability to be willing to suffer through what the world gives him, without running away from it or breaking under it, that makes him remarkable.