Letterman is a very bitter person.
...,and so cutting edge. Dare he speak of Huma? The Muslim brotherhood. Na. His audience is made up off little giggling fools. Conan,Letterman,Lenin. They all suck. Guttertrash talk edited,and written for thirteen year olds. TCM has been Runnin a lot of Johnny Carson shows with some of the interviews with some of his Big name guests. How refreshing to hear an interview without all the noise,and foolishness. A true Master of his craft.
Seems like the “real” personality of most comics is one of bitter nasty people.