Alien beings have scanned your brain and determined you are the perfect person to conduct a little ethics experiment. They are immensely powerful trans-dimensional beings, but almost entirely void of ethical thinking. They relish doing ethics experiments, to see what all the fuss is about it in humans.
So they approach you and give you the following choice: X or Y will be completely obliterated—You pick which.
X: In a distant galaxy (far far away) there is a nonhuman civilization that encompasses thousands of worlds, each containing tens of billions of inhabitants. This species is rich and complex, with hundreds of thousands of years of art, literature, and science.
Y: Your own state (say, California), as well as every library and museum on Earth (including digital libraries). Your immediate family will be removed from harm up to second cousins.
This is all you know.
Is it X or Y for the furnace?
Note: There is no Twilight Zone trick here, with later an alien race having to choose their or our world for destruction.