I said the existent of Aliens WOULDN'T invalidate origin theories. You read it as, the not following invalidates. Probably my comma threw you off.
In any case, there are no aliens. There's no proof of aliens, therefore, there are no aliens. You continue with the game. It's game over as far as I'm concerned.
I agree with you that the seeding of Earth is not a necessary function, but how does it invalidate evolution? And it certainly would not invalidate ALL origin theories. And for you to conclude that other life forms do not exist...without man even seeing 99% of the cosmos, clearly reveals your closed mind. Your arguements are full of holes. Please continue with the game.