Dragons and Balrogs are created children of Melkor/Morgoth- thus they are filled with his lust for power, greed for all things splendid, and malice toward all other living things of Arda that are not under his dominion.
Your right in that a dragon has no practical use for gold and gems, but neither do elves, humans, dwarfs, orc, or hobbits. Such things are purely for enjoyment. They can not be eaten, nor worn as warm garments, nor provide practical shelter. Gold and gems have value because society gives them value.
The good children of Middle Earth go to war over gold and gems (aka the story of The Hobbit). So why is it hard to accept that creature born of greed like dragons would not also covet such impractical item and kill for them?
If the Dwarfs truly cared only for returning to their ancestral home, they could have offered to carve Smaug a new lair, moved his treasure, and given him further treasure in exchange for the city. Or to prevent Smaug from plundering and destroying more lands, they could have forge alliances with others (dwarves, men, and elves) with the offer to split the treasure.
But no, Thorin and company wanted the city and the riches for themselves. How is their greed more acceptable and understandable than Smaug's?
Your right in that a dragon has no practical use for gold and gems, but neither do elves, humans, dwarfs, orc, or hobbits. Such things are purely for enjoyment. They can not be eaten, nor worn as warm garments, nor provide practical shelter. Gold and gems have value because society gives them value.
The good children of Middle Earth go to war over gold and gems (aka the story of The Hobbit). So why is it hard to accept that creature born of greed like dragons would not also covet such impractical item and kill for them?
If the Dwarfs truly cared only for returning to their ancestral home, they could have offered to carve Smaug a new lair, moved his treasure, and given him further treasure in exchange for the city. Or to prevent Smaug from plundering and destroying more lands, they could have forge alliances with others (dwarves, men, and elves) with the offer to split the treasure.
But no, Thorin and company wanted the city and the riches for themselves. How is their greed more acceptable and understandable than Smaug's?