I don't think you're wrong, The interview tactic is not useful for testing morals, your interview is testing the interviewee's aptitude for identifying underhan

I don't think you're wrong, The interview tactic is not useful for testing morals, your interview is testing the interviewee's aptitude for identifying underhanded questions (and/or their ability to sidestep a pointed questioning on a skill they're weak at). But if somebody says "we want to hire you, pick this lock", your first response has simply got to be "wait, we need to discuss this." Is the lock attached to your competitor's back door, or did you just place a lock cylinder on the meeting table? Remember, you're hiring a locksmith. You've provided the applicant an ethical and legally safe environment to apply their skillset and tasked them with proving their skillset. What do you expect to happen? How many of your everyday business skills can be used immorally? If you preface every demonstration or application of your abilities with a moral clarification, my immediate thought would be "The lady doth protest too much, methinks"