In general -- in response/comment to some about O'Reilly -- he employs the Q&A style of posing opposing questions as rhetorical, so the guest/other can respond about possibilities and issues, not that O'Reilly actually believes or thinks as he postulates/questions.
It's a form of public interview, so you can get the guest/other person to state their positions and/or give them the opportunity to counter some public meme or criticism or such, not that O'Reilly believes or opines as such, just that he often mentions points of view as a means of discussion.
I like O'Reilly, in general, and I sure do live Rumsfeld. I thought their discussion was interesting but far too truncated and brief. EVERYthing Rumsfeld has to discuss and say deserves far more focused attention than mere two minutes between commercials...frustrating.
I agree with your points. OR did a GREAT job with the limited venue with Rummy.