Conversation with my cousin

Me:  I wonder how they came to the conclusion that the organic compounds found on mars are from earth...

Cousin:  Maybe the organic compounds on earth are from mars...

Me:  That's what we left of our original planet... when we came to earth our rank structure and government were overthrown/fell apart.  Now there is no record of us even being intelligent enough to travel the darkness of space, let alone colonizing another planet.  We are doomed to repeat the ignorant humanoid survivalist method.

Cousin:  Mars is our inevitable demise, our future, our past, our home.

Me:  Maybe it was the workers in the bowels of our ships that started the ku...  We descended from apes because apes descended from the workers who shoveled dark matter into our engines, we are the descendants of Deltas...  "Mr. Foster's calculating enthusiasm (rubbing his hands in excitement) is concentrated here with the horror of the caste system - horrible not only in its restictive predetermining qualities, but also for the destructive, malevolent, harmful way in which its ends are achieved..." We had it coming.

The dinosaurs weren't destroyed by a natural disaster... unless it's a natural occurrence for potentially inerplanetary species to nuke said planet (earth) so that in a couple hundred years we could move down into the now semi habitable planet and start our new lives only to be murdered shortly after our arrival by a lesser class (or ourselves) made by our own means.