It looks like the people on earth are terrorists
So some people all moved away into space, and the remaining ppl on earth turned it into a shit hole, and now want to destroy the colony as there sick of the shit they created on earth
Granted no individual living created the environment they live in but instead inherited it, Instead of trying to change it, they embrace it, and want to attack the peace loving ppl in space who want to be left alone
at least thats what i got from the trailer
could be the colonists fire torpedoes at earth in a sick game of rich people darts, but from the trailer the elisians just want to live in paradise and the earthers want to shit on it