@ArwenUdomiel Actually, in the forward to the Second Edition Tolkien himself says, "But I cordially dislike allegory in all its manifestations, and always have done so since I grew old and wary enough to detect its presence. I much prefer history, true or feigned, with its varied applicability to the thought and experience of readers. I think that many confuse ‘applicability’ with ‘allegory’; but the one resides in the freedom of the reader, and the other in the purposed domination of the author."
So as The Professor says, applicability is the key. What is actually being discussed here is applicability confused for allegory. Tolkien didn't write any of it with the express intent for it to be allegorical, but he would be delighted that readers are able to take his writing and apply their own meaning and learn their own lessons from it.