What detail from the hobbit develops the theme of blind greed will hurt you?

The dwarves are so worried that the elves will steal their treasure that they lie to the elves about their journey through Mirkwood. This develops the theme that blind greed will hurt you.

Because the dwarves are greedy so they lie because they want the treasure

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.