Recently when I was killing dregs and vandals in front of each other it occurred to me, do they care that I'm murdering their friends, comrades, families?
Sure, the Vex are robots. The hive are monsters and the Cabal are a military force. But the Fallen are just scavengers, they are people like the rest of us - no?
Genuine question that results from the blatant lack of lore.
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Read the Grimoire about them. There's PLENTY of lore. And personally I believe that we are killing the Fallen simply out of a knee jerk reaction. I think they're in the same position that humanity finds itself in. We shouldn't be fighting them, nor should we fear them. I honestly think that the war between us and them is a distraction from what the real threat is.