I watched this video from DestinyBungieOrg on YouTube referring Destiny Rotunda Experience E3 2013 and I got to thinking did the traveler make life on other planets and did it change the planets and did it make the enemy we will have to face in the destiny game
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Since the traveler saved us and has been protecting our last place of existence, it would reason that it fancied us for some reason ... Also, that vid and info suggest that the Traveler did not touch every planet, only some and it seems like they were the ones we had civilizations on already. If I remember they mention we had 4 worlds before near extinction.