Sayid is incredibly conflicted when it comes to his "gift" of interrogation. He knows that sometimes it is necessary, but he knows that it changes him and affects him, so he tries to seperate himself from it as much as possible. But I think deep down inside of him he knows it will always be a part of him, he just outwardly denies it.
Good point about Sun. Once Juliet finds out she's preggers (assuming she doesn't already know), it's on.