I'm fine with the premise

Actually I'm rooting for the alien to annihilated humanity.
Existence is painful anyway.
Why the hell we care that humanity survived or not.
Nobody gives no shit because nobody left to give one in the first place.

I'm kinda agree with agent smith from the matrix, human is a virus that keep multiply and consuming resources dry.

and fuck all the people that they think they important to the world. You just vulnerable piece of flesh that stuck here on earth like the rest of us.