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Was Bolg actually trying to avenge the death of his father? What little is said of him seems to suggest to me that he was mainly interested in seizing the dragon-gold. Then again it also seems that he was at least somewhat motivated to avenge the death of the Great Goblin, which might have a similar connotation: "Ever since the fall of the Great Goblin of the Misty Mountains the hatred of their race for the dwarves had been rekindled to fury," (The Hobbit) so I suppose they did have a sense of loyalty or camaraderie, albeit a rather negative one based on shared hatred for other people and survival instincts. I think this is to an extent evident with the conversation between Shagrat and Gorbag in The Lord of the Rings as well. I don't think Orcs were wholly evil, although even the vestiges of positivity in them mostly manifested in evil ways.
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