I aimlessly travel meaning I have no agenda other than to get small in the world be quiet and observe people.
The point of mythology or myth is to point to the horizon and to point back to ourselves: This is who we are this is where we came from and this is where we're going. And a lot of Western society over the last hundred years - the last 50 years really - has lost that. We have become rather aimless and wandering.
America's greatness has been the greatness of a free people who shared certain moral commitments. Freedom without moral commitment is aimless and promptly self-destructive.