Alien worlds in fiction often unavoidably have human morals (or simply the opposite of human morals), human civilisation structures... and we can't be sure that's how aliens would really work.
That said, trying to think up a truly alien culture and civilisation is basically impossible, huh.
... honestly I'm not sure how I would feel about Earth having the first life in the universe. That would be cool and would also suck at the same time.