People are slowly drifting toward absurd/disgusting/carnivalesque media...
If you look at Aqua Teen Hunger Force and it's absurd plots and very basis, it's a very good example.
Another is Wonder Showzen.
Television shows which are so shallow and almost plotless, fast-paced, and simply bent on startling/frightening/grossing people out... and it's a form of entertainment. It's the same entertainment people got at amusement parks and carnivals... they want quick, rapid-fire entertainment of little thought and pure stimuli-and what better stimuli than stimuli that utterly provokes hard sensations and feelings? Like feelings of hate, sickness, disgust, etc. It is very easy to strike those emotions onto people with images and sounds.
Adult Swim is just following this growing trend. My friend, Alex, and I joke about the generation we're in. We call it the ADD generation. Television shows, especially those marketed toward us, have to be very quick, with jokes that don't have to follow a plot, but are short enough to keep our cynical attentions. Family Guy spurting off seemingly irrelevant jokes every 30 seconds? Wonder Showzen employing quickand short stories to help the overall meaningless plot?
PeeWee herman has that same kind of bizarre, meaningless, weird, and almost disgusting humor/appeal that the other shows have.