The job of an interviewer is to attempt to refute the interviewee's position as well as possible. In other words, the interviewer should imagine the protestatio

The job of an interviewer is to attempt to refute the interviewee's position as well as possible. In other words, the interviewer should imagine the protestations of their most antagonistic viewer and voice them. This gives the interviewee the opportunity to defend their position, and, hopefully, to attack the common arguments against them.