There's no misunderstanding with the fallen. They were once a united species until the traveler came, and left. When the traveler left, it did so in a hurry and without defending the species that it asked to defend it. Now the fallen are divided into several houses, have no home, and have (as their name suggests) fallen from greatness. Even if the traveler was just going around giving free tech that doesn't make it good if everywhere it goes it brings death, destruction, and strife in its wake. Furthermore, where does it get the tech? Ever heard, "there ain't no such thing as a free lunch?" How would you feel if our tech was made from Fallen slaves of the traveler? Or taken from the fallen when it deserted them? Plus our guardians don't even have free will. We get revived from the dead, get told to do defend an entity (that has a history of desertion) with our new lives, and they just do it. Without question none the less. I'm not saying it's evil, but if you think it's good than you're just blind.