He's always had a social critic and philosopher poet part of him, but it definitely became more prominent later in life. He sprinkled some jokes in during the serious parts, such as everyone being fucked by the red white and blue dick.
A lot of what he says is dead on and he's just trying to use his podium to make people think about something he thinks is important. And offensive.
They couldn't show this on TV when he died because it contained naughty words. Instead they used some of his worst material and some pictures of him making funny faces because when you're an Atheist and you die, nobody knows what to say, and when you tell the truth, they can't broadcast it because its "indecent."
I wish one network had the balls to show his Words You Can't Say on TV bit when he died, that would be the only fitting sendoff. But no, we live in a country of easily offended faggots that hate Political Correctness, yet freely accept censorship.