obviously you haven't been paying attention then.
They always throw in a stupid episode here and there in order to avoid being preachy. Last season it was "marjorine" this season it was "a million little fibers"
People need to stop expecting the show to be X, where X is constant political or social commentary,and realize it's all about matt and trey having fun making the show.
Actually, I'm the polar opposite. I don't expect South Park to be constant political & social commentary & wish they'd do much less of it.
It's a better show when they focus on the kids & the townspeople & avoid the excessive preachiness. Not that I don't agree with much of what they have to say. I just think they do it pretty clumsily.
Marjorine is definitely in my top five. Cartmans sense of purpose in that one is LOL funny. And the Butters fake death.....man, funny stuff!