South Park is a pretty intelligent show. It's anti-establishment and counter-culture. Every episode takes a "fad du jour" and shows the ridiculousness we sometimes submit ourselves to. It denounces mass-consumerism and teaches you about the vast negative influences of the media conglomerates.
It does so in a tongue and cheek way with usually a vulgar delivery.
Of course, you have to watch at a higher level to understand any of this. The common folks just think it's all fart/ass jokes, but that's the people the show is showing in a negative light anyway, the ones that give in to whatever CNN/Fox/MSNBC and the advertising companies feed them.
You're not one of those people now are you ? Because that would be ****ing stupid.