The Late Show With Stephen Colbert just breathed its last, and what is there to say? Late night talk shows started as a way to be amused in the hours where you couldn't quite get to sleep, and as long as they hewed to that purpose they were in good shape. When they started functioning as a validation of the politics of part of their audience that was the beginning of the end. I think this is coming to be generally acknowledged.
Anyway, it's in relation that event that this post has resurfaced. Feser has some pretty solid ideas of what comedy is and isn't.
The problem is not that the progressives in question look at humor through the wrong political lens. The problem is that looking at humor through any political lens, including the right one, is simply to misunderstand the nature of humor. The fact is that there does not seem to be any essential connection at all between something’s being funny and it’s conveying some truth, uncomfortable or otherwise.
There is much truth to this. Duck Soup is often remembered as a masterful satire on the absurdities of war, and sure you can take that message from it. But if that's really what the Marx Brothers were trying to do, rather than―as Groucho put it―"four Jews trying to be funny", it probably would be a lot less watchable.
As for black comedy, I think that is funny because of the relief factor. The very fact that you're not supposed to make jokes about certain subjects makes it funnier when you do.