The determinism you present, dear sir, just doesn't seem in keeping with my reading of LotR. May I suggest that trying to get an 'inexorable force' and 'individual freedom' to square with each other in any logical way is an exercise in futility. Best to leave the paradox in all of its realities in the balance that we find it in real life as well as in really good fantasy. But hey, if you like exercises in futility, have at it!