Our conceptions of a raving lunatic differ some 180 degrees, I think. From what I have seen, he has been deadly cold and most of the time totally unemotional during the show. I believe he planned himself how to steal Emily from such a central system of Union, he fought so extremely succesfully against other strains, he retrieved Emily from the space station, streered the space ship into a collision course... It doesn't sound like a raving lunatic to me. It sounds like a man ready to do anything for his goal. Despite having some apparently lethal disease (he's being pretty sickly every now and then). I have no doubt he received some trauma from the incident, but he can still think clearly. He's crazy, no doubt, but thinking far more clearly than many of the sane people in this series (or in general). It's just twisted clearness of vision.