Theme of new movie - Stop polluting and destroying the planet with your wasteful usage of fossil fuels or we will kill you, but don't ask me to share my never-ending, cheap, non-polluting energy source I used to come here.
Watch it again
Theme of original movie - Fight all you want amongst yourselves. But now that you have atomic weapons AND space travel you pose a threat to others.
Behave yourselves, you primitive screwheads, or we'll sic our monster robot on you.