I mean that's just interviewing for the sake of conversation at that point. Nothing wrong with that, but it can get a bit carried away into some fantasy world.
Well, it depends on what the question is. Some scenarios are very far-flung, but a straight answer to them provides insight into the candidate's moral compass. Usually an applicant's true ethical and moral standards can be revealed only in black-or-white situations that are highly unlikely to occur in real life.