Tell me. why shouldn't this exist?
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That's not an excuse I've seen games were you make peace with a bad guyThis is a game, not real life. The bosses that we killed in the Nighthold were all either monsters created by the Nightwell or supporting the Legion. They had more than enough time to flee when they realized that the Nighthold was under attack, but instead they decided to stay and fight for Elisande/the Legion. If we had let these powerful allies of hers live, they would have just gone on to be puppets of the Legion in the future. All the Legion would need to do is promise wealth and power to Star Augur, for example, to win him over as a future ally after his city was taken over.
Responding to other examples:
1. We killed the Blast Furnace (or rather the boss inside of the furnace) because it had already made a pact with the Iron Horde. It's possible that it would surrender and join us after being beaten half to death, but it certainly didn't.
2. Operator Tho'gar was working for Blackhand and was ready to fight to the death to protect the Foundry. It's not purely a business relationship between the two when Tho'gar and Blackhand are from the same clan.
3. Mar'gok was allied with the Iron Horde when we killed him. We could have offered him a better deal in theory, but he was extremely arrogant. What he says when you pull him in Highmaul is, "You will learn why I am king, and you are little more than peasants!" The odds of him switching his allegiance to outsiders who he sees as less than dirt are slim to none.