Republicans, on the other hand, are crazy, irrational and filled with hate. It's good to laugh at such stupid people. And anyone who treats Republicans are serious people is -- of course -- an "activist" by pretending that Republicans have something of value to contribute.
For Stewart, this is all very clear and simple.
That makes sense.
And his ego is so massive (like Obozo’s) that in his mind, he has all the right answers, and anybody who disagrees is thus either “stupid” or intelligent, but “evil”.