Of ALL the tribes in the region over the generations, remember who wrote the story.
So are you going to argue with GOD for his choice of people to write history. You are just in denial that GOD can, and did had a favorite group of people that he has chosen for great and miraclulous events.
Can't a pottery worker/artist have a favorite vase, or work of art? Are you going to argue with GOD about HIS decision making. Well go to it!!