I agree. I had a "conversion" against George Carlin, whom I used to think was always terrific (20 years ago). I can still laugh at some of Carlin's older skits, but once I realized how deeply, insanely liberal George Carlin really is, it just didn't seem the same anymore, and I stopped laughing.
In regards to Stewart, it was my impression that once the USSC ruled against Gore I couldn't take the show anymore.
In regards to Carlin - boy where do I start? I was raised on Carlin and have and still feel that he helped develop my intellect by his impressive ability of taking any issue and having made it pliable for a variety of view points. He also didn't need to swear except when actually talking about the swear word itself. At the time I didn't know enough enough about some of the political issues to be annoyed and even in retrospect, the albums he did under the Little David label still hold because he made his point, right or wrong, by a quiet, silly manner while not resorting to outright insults
Then George did a complete 180. He looked around at the current brethern crop and came to the conclusion that loud, obscenity-laced humor was the way to go. He now uses profanity for literally every ten words. That's alot. He broaches subjects such as abortion with such utter vile that he would make Richard Pryor blush.
The bottomline is that George has completely sold his old, reasonable, quiet but penetrating ways for an expedient loudmouth persona. As with so many liberals he has become everything he used to say he was against. He sold out to the establishment and is a long way from ever rediscovering his soul.