battlestar galactica v. weltschmertz

Am I putting too much nuance into the show Battlestar Galactica ?

"The story unfolds in a distant galaxy as Mankind has reached its Seventh Millenia of recorded history. Twelve (12) worlds in a multi-star system are home to the Twelve Colonies of Man. According to the ancient writings, the Twelve Colonies were settled by those who journeyed from a mother world, Kobol. Of particular note: a thirteenth tribe of humans moved across the stars to settle another world: Earth. By the present Colonial day in the series, Earth was considered a myth and little was known about the Colonials' true origins, save for the writings in the Book of Kobol (the Colonials' "bible").

...a handful of surviving Colonials flee the Twelve Colonies in civilian starcraft. Under the command of Adama on the Galactica, they head into deep space, searching for the Thirteenth Tribe of Man who are "on a shining planet known as Earth." "