Yep totally agree with you, nothing can be certain at this point and Darkness is just Darkness because it seems aggresiv toward us. And yes Vex are certainly the most devoted ennemies we encounter but what is bothering me about them is when we learn that they have dormant machines on every planet (during the last mission on mars) and also the capacity to teleport everywhere in the galaxy in an instant (campus K9 mission I think). Why not just overun the Earth? Even if the Traveler is Evil, erasing humanity and securing itself wih the Vex could be a good strategy in order to wait for it to be functional again. Well, we'll see in time when Bungie will add more Lore. Anyway, Thank you for reading me and taking the time to discuss it.