I know this is a silly conversation, but that's not what happens. Their motivation for "lobotomizing" the ship was that it was going to destroy them. They work

I know this is a silly conversation, but that's not what happens. Their motivation for "lobotomizing" the ship was that it was going to destroy them. They worked to preserve their existence, and let the new lifeform go its own way. If anything, the outcome was a trite, touchy feely ending, only vaguely discussing the actual implication of the new lifeform, while they got back on course to their original mission.