Interesting side to take. I never thought of it that way. I think hummanity could have been able to damage it in the golden age, but the traveler is beyond them. It seems to be way above the halos. If you remember them saying that something almost wiped us out, but the traveler saved us. Sadly I don't think the traveler almost destroyed itself to save a race it tried to destroy. There is still a possibility though. However, there might be multiple travelers, so maybe one is evil and actually goes around enslaving races.