Light and darkness are defined by each other. There is no bad or good about either one for they are both necessary for the existence of the other. To illustrate this, define what a shadow is. It's the absence of light and light is the absence of darkness.
The only thing that we as guardians are fighting for is survival, which is pretty much the same thing the Fallen, the Vex and the Hive are all fighting for. None of these can really be called Evil in any objective sense of the word.
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The hive aren't fighting for survival anymore. The go by the sword logic which says that only the strongest deserve to live so they kill everything else to prove that they are the strongest.
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And by that, they survive. They still must kill stronger and stronger enemies in order to satisfy their worm's hunger. Oryx doesn't anymore, obviously but Savathun and Xiva Aruth do.
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True, seem to have forgot about that in the minute it took me to type my response.
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For survival, all races need the traveler. The guardians and fallen need the traveler for protection, the hive and vex need the traveler destroyed for the darkness. The cabal just want to destroy everything and show military superiority
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Yeah the Cabal may be the closest to evil as they are the only ones that are killing for the sake of killing. Everyone else is warring for their own survival, and you can't blame them.