I've avoided calling the traveller evil, I simply have always maintained that I don't trust it. We don't know enough about it to have any inclings as to what it's agenda or morality might be. The fact that it shares so little information about itself is suspicious. Despite all of the depositories of knowledge we've raided, we are given very little information... why is this being kept from us. Why is our memory a blank? The book of sorrow is very interesting. To me it suggests that we are just caught up in the middle of something that is much larger than we are. Stuck between two extremes who, in their extremity, are actually quite sisimillar, and we are just caught in their wake. When the hive we're created to fight and win the "Darkness" its freedom from the traveller it perused the traveller. Now the rolls are reversed, and the guardians have been created to liberate the Traveller. What will happen when we wake it up? Will it fight, or will it flee leaving us as it left the Fallen? And what roll do the Vex play in all of this? The traveller just is. We are led to belive that it is just, and right... we don't know any different because we aren't shown any other perspectives. We belive it is good because it helped us, but we don't understand its motivations.