Envy.
And he's a happy warrior who gets in the way of their Glum. Hannity's attackers on the Right are like Eeyore, for whom depression is rewarding.
The point is that Hannity is swinging. Those who say I know all this nothing new miss the point that you cannot do this sort of thing enough. there are too many Freepers with fly swatters trying to convince everyone they know it all when in reality they are not even listened to.