Yes, I have been attempting to analyze why it is that Mr. Carlin doesn't seem to "disengage" his audience when he speaks truth. He comes across like, "this is how I see it, I don't know how you see it".... And the listener, as you put it, doesn't view or hear it as a "rant", and is more receptive to the message. Seems he has a way of taking a "serious" subject apart with an "innocent logic" that has a certain appeal. Of course, taking the humor approach always seems to lessen "tensions."
Mr. Carlin is 70 years old now. I remember when he did the "Hippy-Dippy Weatherman"..... "The weather forcast for tonight: dark." He was deemed "anti-establishment" then. He seems to have had it pretty well figured out back in the 1970s.
Since he seems to be an awake, aware and intelligent person and has a way of presenting things so that people actually "listen" to the message and pause and reflect on it, I think it would be interesting to see what he could do with the subject of psychopathy.