Smaug, living at the center and root of Lonely Mountain, is quite literally represented as a Mountain of Rage. His rage is responsible for:
Desolation Hating all living things Destroying all fertility
Creating Deserts Leaving nothing alive Burning the world
Creating terror Spreading darkness wherever he goes
What might cause such immense rage? Does this kind of rage exist only in dragons? If not, where else might it exist? What might we learn from Smaug's existence?
1. Smaug is so angry because as a dragon they like to have treasure and he believes the treasure was rightfully his also dragons are very greedy and he is always worried people are trying to steal his treasure so he is always angry.
2. First No i don't think it would be just in dragons I think this kind of rage could exist in anyone if they became corrupt and evil and also controlled by their greed for example Thorin could have become very similar is he had a greater opportunity.
3.I think from his existence we can learn there will always be an opposing evil. Also we can learn that greed will never lead to good thing as it just leads to isolation and overall misery. As well it teaches us that it is better to share and do the right thing.