What's with the cursing?

I'm not a prude. I don't fall apart at the word fuck or any other obscenity. Still it is a mystery to me why highly intelligent people like John Oliver, Penn Jillette, Bill Maher, Lewis Black and many others cannot seem to convey an idea without the liberal use of curses, swears, obscenities. They will present highly reasonable, well thought-out ideas and concepts, opinions and analyses, but never without constant use of fuck, shit, asshole, and dozens of other curse words that are not only crude but make them sound angry despite the theme. Surely they all have enough of a command on the English language to get through a single idea without peppering their speech with the kind of language you mostly hear on the street from lower-class people. What are they trying to prove? This flaw doesn't make them unwatchable, but it does make them seem angrier, less admirable, less controlled, more neurotic, more common. Does it make a difference? Yes, I think it does. "No man is an island." Is much more thought-provoking and profound than "No man is a fucking island." At least I think so.