AHOY! ALL ABOARD THE S.S. SPECULATION!!
Seriously think about this. The Traveler made it possible, with it's space magic, for us to live on other planets. Due to this, we drew the attention of an alien power so great that it almost destroyed us completely. The only thing that saved us was the Traveler. I think it might have done so out of guilt. I mean without it we wouldn't have advanced as fast, sure. But also, we could have hidden a while longer from the great evil that almost destroyed us. What do you think about this?
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Hmmm...first of all we gotta ask where did the traveler come from...