Originally Posted by Frogmeister

Ben is like a cockroach, he knows how to survive. He may or may not benefit the people around him in his actions. One thing you can be certain of, he will act in his own best interest above all. He truly believes the people coming from the "freighter" are going to wipe out the life found there. That is why he wanted Rousseau to take away his daughter.
She is the only thing he cares about outside of himself.