On the other hand Neal, progress usually requires the pushing of previous boundaries. Your analysis here does not mention people like George Carlin and more importantly, Lenny Bruce. Commentators said many of the same things about Bruce that you are saying about people like Colbert. The other point about "Trump humor" (a term which might be an oxymoron) is that it's most cutting and effective in drawing attention to important issues when it uses his own words with little embellishment. I'm currently in NYC on a trip and was fortunate to be in upper Manhattan when Melissa McCarthy rode her podium down the street. It was hilarious.