Throughout the campaign we are constantly reminded of how thin the line between light and dark is; not just from the general voice over, but by the Fanatic, and Uldren as well. This entire time we’ve thought that we were the constant hero that was unconditionally protecting the last of humanity.
However, we seem to be nothing more than glorified bodyguards of the traveler seeking to do nothing but selfishly retain the power we’ve been given. Granted, there are those who are obviously antagonistic like the Hive, but for the most part it seems like other species (like the Fallen) are simply trying to either establish, or reestablish themselves with the Traveler.
Honestly, most of the events to this point are of our doing; especially with the Fallen. Kudos to Bungie’s writers for including this tid-bit of moral questioning in this expansion. It really makes you question our intentions as guardians.
“It’s not the what, but the why we are doing something”
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Fallen are the only species we should legit feel bad for. The vex are cold machines that simply exist to make sure they exist everywhere. They don't do things out of being evil or whatever. But we have the right to defend ourselves from them by attacking first. Cabal are conqurers. They don't deserve pity. And the hive are basically just corpses filled with evil.