I think there is some "fortuitous things just keep happening to these people" in much fiction, and certainly the LOTR series, right? If you or I was given a knife that glowed when trolls were around, that would probably be the most amazing thing that ever happened to us. To Frodo it's a footnote, right along with "met and was rended minor aid by the oldest corporeal creature in the universe".
Ultimately, I can only offer conjecture, but given what we know of Tolkein's deeply religious personal perspective, it's not difficult to imagine that his fantastic universe is pervaded by an overwhelming force of goodness that seeks to bring events to their right conclusion through divine providence.
> his fantastic universe is pervaded by an overwhelming force of goodness that seeks to bring events to their right conclusion through divine providence.
That is, in fact, explicitly stated in The Silmarillion.
"Then Ilúvatar (the God/Yahweh creator spirit) spoke, and he said: 'Mighty are the Ainur (the angels), and mightiest among them is Melkor (Satan / the fallen angel); but that he may know, and all the Ainur, that I am Ilúvatar, those things that ye have sung, I will show them forth, that ye may see what ye have done. And thou, Melkor, shalt see that no theme may be played that hath not its uttermost source in me, nor can any alter the music in my despite. For he that attempteth this shall prove but mine instrument in the devising of things more wonderful, which he himself hath not imagined."
Ultimately, I can only offer conjecture, but given what we know of Tolkein's deeply religious personal perspective, it's not difficult to imagine that his fantastic universe is pervaded by an overwhelming force of goodness that seeks to bring events to their right conclusion through divine providence.