They wished earth which was their first huge objective earlier than settling within the photo voltaic system and for this they didn’t launch a warfare. They only made the people savage and destroyed the bond that was current between them and made them a society. They have been working solo in The fifth Wave after which the relation between Cassie and Evan Walker was only a illustration that the humanity was there. How a lot the people can bear is one other query that “Others” can’t discover a solution too, they’ve survived the primary 4 waves, not all of them in fact.