Anon is right about the labor thing though.
I've said this before but we will find out about space, in the usual limited fashion when they want an army of tax slaves up there. Speaking of tax and labor, tax is literally theft of labor or in other words: You don't own the labor you perform with your own two hands.
Pretty easy to find someone that asks the are we alone question but fail to observe the plainly observable in front of their face.