That's because he has been so thoroughly smeared they wouldn't consider it. Can you imagine suggesting to someone like Katie Couric that she read Machiavelli? She'd wrinkle her nose in disgust and say something stupid.
Most of the people like Gimbel, Couric, and the like never read anything deep in their lives. So, before the fame of Machiavelli scares them away, it it the requirement to think that does that.