I've thought all along we work for the bad guy.
Look at the names of our enemies.
Knights, that's a good guy title in its self.
Wizards, that's a good guy term.
Traveler sounds like something out of ghostbusters as the bad guy. He gave them knowledge. Well satan gave Eve knowledge when she ate of the forbidden fruit.
We are hunters, Titans and warlocks. All bad guy job titles.
It makes perfect sense to assume we work for the bad guy.
I guess. But I do not think Bungie will do a huge plot twist like that. It would mess up the whole mechanics of the game I mean seriously will they make a whole new mission to fight the speaker a shabby little dude in a mask? Also not all of our names are bad. Hunters can simply be a village hunter or someone who provides food and Titans can be something like a defender. Also you only have two names of enemies that sound kind of good. I mean seriously Goblins Dregs Vandals Hydras Minotaurs Ogres and many more. There are way more bad names then good names.