"Harry Potter" is make-believe, and quite entertaining. "The Illiad" and "Lord of the Rings" are mythology, and also teach us while they entertain.
As a scholar, Tolkien lamented the destruction of whatever original mythology England might have had. So he decided to create one suitable for the country he loved so much. The books are only the tip of the iceberg, which includes a cosmology, history, and complete languages.
It's monumental effort over the course of his adult life, and a tribute to his scholarship and dedication. The story-behind-the-story holds valuable lessons for us, too.
umm... you guys know this is all make-believe, right...?
And, so indeed, are you, for are not trolls purely mythical? Ergo, you are make-believe, and don't exist, either.
Maybe you are one of those philistines who thinks that Shakespeare is nothing more than ink on paper, that Mozart is just a bunch of musical notes, that a Stradivarius is merely wood and varnish, etc...
A troll, and a philistine, who thinks he is "funny", and who endlessly spams the Hobbit Holes threads with the same post.
There are two theories about trolls..."don't feed the troll" posits the idea that if you ignore them, they will go away; the opposite theory is that if exposed to sunlight, they will turn into stone...