Hannity, O'reily, ect... These are intelligent people. Intelligent enough to understand that if they take their character and to act a certain way they will maximize their ratings. Underneath the surface, they're not really that nuts.
What's intersting is the fact that fox news attains the highest ratings because it gets both dilusional republicans and rationale liberals. Republicans because they say nutty things people can rant about and liberals because they are so flabbergasted at what is actully being ejected from the news casters mouth.
Hannity and Oreily understand this, and they exploit this niche. How crazy they really are cannot be determined and won't ever be revealed. Who should be accountable are the suits whom program this stuff even now in the twenty-first century. They make the crazy, crazier. It's like pouring shots for abusive alcoholics.